esp8266/uart: Remove obsolete UART rx buffering code.
esp8266/uart: Remove obsolete UART rx buffering code.

It's now completely replaced by the ringbuf implementation.

tobbad/micropython,MrSurly/micropython,mhoffma/micropython,matthewelse/micropython,turbinenreiter/micropython,ganshun666/micropython,drrk/micropython,cwyark/micropython,misterdanb/micropython,lowRISC/micropython,PappaPeppar/micropython,Timmenem/micropython,bvernoux/micropython,redbear/micropython,bvernoux/micropython,Timmenem/micropython,selste/micropython,mhoffma/micropython,trezor/micropython,toolmacher/micropython,Timmenem/micropython,alex-march/micropython,hiway/micropython,tobbad/micropython,henriknelson/micropython,bvernoux/micropython,tuc-osg/micropython,trezor/micropython,alex-march/micropython,matthewelse/micropython,chrisdearman/micropython,turbinenreiter/micropython,kerneltask/micropython,Timmenem/micropython,kerneltask/micropython,blazewicz/micropython,ryannathans/micropython,pozetroninc/micropython,hosaka/micropython,deshipu/micropython,TDAbboud/micropython,henriknelson/micropython,Peetz0r/micropython-esp32,misterdanb/micropython,deshipu/micropython,blazewicz/micropython,deshipu/micropython,ganshun666/micropython,hiway/micropython,trezor/micropython,tobbad/micropython,toolmacher/micropython,chrisdearman/micropython,jmarcelino/pycom-micropython,mhoffma/micropython,oopy/micropython,emfcamp/micropython,lowRISC/micropython,turbinenreiter/micropython,deshipu/micropython,swegener/micropython,AriZuu/micropython,MrSurly/micropython,MrSurly/micropython,alex-robbins/micropython,dinau/micropython,blazewicz/micropython,cwyark/micropython,AriZuu/micropython,dmazzella/micropython,ryannathans/micropython,jmarcelino/pycom-micropython,ryannathans/micropython,pozetroninc/micropython,pozetroninc/micropython,pfalcon/micropython,praemdonck/micropython,bvernoux/micropython,alex-robbins/micropython,tralamazza/micropython,micropython/micropython-esp32,infinnovation/micropython,dinau/micropython,pramasoul/micropython,lowRISC/micropython,Peetz0r/micropython-esp32,turbinenreiter/micropython,adafruit/circuitpython,TDAbboud/micropython,chrisdearman/micropython,pramasoul/micropython,chrisdearman/micropython,swegener/micropython,pramasoul/micropython,hosaka/micropython,adafruit/micropython,selste/micropython,PappaPeppar/micropython,TDAbboud/micropython,infinnovation/micropython,hosaka/micropython,ryannathans/micropython,torwag/micropython,pramasoul/micropython,swegener/micropython,dxxb/micropython,dxxb/micropython,trezor/micropython,matthewelse/micropython,tuc-osg/micropython,SHA2017-badge/micropython-esp32,cwyark/micropython,adafruit/micropython,tralamazza/micropython,ganshun666/micropython,adafruit/circuitpython,kerneltask/micropython,puuu/micropython,tobbad/micropython,selste/micropython,hiway/micropython,alex-robbins/micropython,alex-march/micropython,redbear/micropython,pozetroninc/micropython,praemdonck/micropython,henriknelson/micropython,praemdonck/micropython,misterdanb/micropython,emfcamp/micropython,adafruit/micropython,emfcamp/micropython,HenrikSolver/micropython,tuc-osg/micropython,torwag/micropython,mhoffma/micropython,lowRISC/micropython,oopy/micropython,swegener/micropython,alex-march/micropython,redbear/micropython,HenrikSolver/micropython,MrSurly/micropython-esp32,hosaka/micropython,dinau/micropython,bvernoux/micropython,dmazzella/micropython,cwyark/micropython,SHA2017-badge/micropython-esp32,AriZuu/micropython,blazewicz/micropython,selste/micropython,misterdanb/micropython,puuu/micropython,torwag/micropython,puuu/micropython,pfalcon/micropython,Peetz0r/micropython-esp32,pfalcon/micropython,misterdanb/micropython,Peetz0r/micropython-esp32,turbinenreiter/micropython,micropython/micropython-esp32,puuu/micropython,drrk/micropython,chrisdearman/micropython,HenrikSolver/micropython,toolmacher/micropython,dxxb/micropython,pramasoul/micropython,alex-robbins/micropython,infinnovation/micropython,tralamazza/micropython,Peetz0r/micropython-esp32,adafruit/circuitpython,redbear/micropython,pfalcon/micropython,alex-robbins/micropython,deshipu/micropython,PappaPeppar/micropython,matthewelse/micropython,trezor/micropython,drrk/micropython,dmazzella/micropython,drrk/micropython,matthewelse/micropython,alex-march/micropython,tuc-osg/micropython,MrSurly/micropython-esp32,hosaka/micropython,oopy/micropython,mhoffma/micropython,dmazzella/micropython,praemdonck/micropython,toolmacher/micropython,dxxb/micropython,PappaPeppar/micropython,oopy/micropython,MrSurly/micropython,henriknelson/micropython,hiway/micropython,dxxb/micropython,MrSurly/micropython-esp32,selste/micropython,redbear/micropython,torwag/micropython,SHA2017-badge/micropython-esp32,matthewelse/micropython,HenrikSolver/micropython,mpalomer/micropython,AriZuu/micropython,adafruit/circuitpython,mpalomer/micropython,HenrikSolver/micropython,TDAbboud/micropython,micropython/micropython-esp32,torwag/micropython,kerneltask/micropython,dinau/micropython,emfcamp/micropython,adafruit/circuitpython,tobbad/micropython,ganshun666/micropython,tralamazza/micropython,adafruit/micropython,pfalcon/micropython,dinau/micropython,Timmenem/micropython,blazewicz/micropython,lowRISC/micropython,ryannathans/micropython,tuc-osg/micropython,adafruit/circuitpython,mpalomer/micropython,pozetroninc/micropython,jmarcelino/pycom-micropython,puuu/micropython,mpalomer/micropython,emfcamp/micropython,kerneltask/micropython,adafruit/micropython,MrSurly/micropython,micropython/micropython-esp32,oopy/micropython,MrSurly/micropython-esp32,swegener/micropython,PappaPeppar/micropython,jmarcelino/pycom-micropython,cwyark/micropython,jmarcelino/pycom-micropython,micropython/micropython-esp32,toolmacher/micropython,SHA2017-badge/micropython-esp32,infinnovation/micropython,henriknelson/micropython,ganshun666/micropython,MrSurly/micropython-esp32,SHA2017-badge/micropython-esp32,hiway/micropython,infinnovation/micropython,mpalomer/micropython,TDAbboud/micropython,AriZuu/micropython,praemdonck/micropython,drrk/micropython