stmhal/servo: Make pyb.Servo(n) map to Pin('Xn') on all MCUs.
stmhal/servo: Make pyb.Servo(n) map to Pin('Xn') on all MCUs.

Prior to this patch Servo numbers 1, 2, 3, 4 mapped to pins X3, X4, X1, X2
on PYBLITE which doesn't match the standard PYB mapping.  This patch fixes
the mapping.

dmazzella/micropython,infinnovation/micropython,infinnovation/micropython,ryannathans/micropython,trezor/micropython,micropython/micropython-esp32,henriknelson/micropython,HenrikSolver/micropython,TDAbboud/micropython,kerneltask/micropython,Timmenem/micropython,tobbad/micropython,micropython/micropython-esp32,SHA2017-badge/micropython-esp32,MrSurly/micropython-esp32,AriZuu/micropython,blazewicz/micropython,TDAbboud/micropython,AriZuu/micropython,infinnovation/micropython,pozetroninc/micropython,pozetroninc/micropython,SHA2017-badge/micropython-esp32,alex-robbins/micropython,PappaPeppar/micropython,trezor/micropython,adafruit/circuitpython,pramasoul/micropython,adafruit/circuitpython,pozetroninc/micropython,ryannathans/micropython,oopy/micropython,tralamazza/micropython,dmazzella/micropython,chrisdearman/micropython,trezor/micropython,tobbad/micropython,adafruit/circuitpython,HenrikSolver/micropython,PappaPeppar/micropython,MrSurly/micropython-esp32,AriZuu/micropython,Timmenem/micropython,MrSurly/micropython,swegener/micropython,dmazzella/micropython,pramasoul/micropython,torwag/micropython,henriknelson/micropython,swegener/micropython,MrSurly/micropython,bvernoux/micropython,bvernoux/micropython,MrSurly/micropython-esp32,MrSurly/micropython-esp32,pozetroninc/micropython,blazewicz/micropython,blazewicz/micropython,MrSurly/micropython,ryannathans/micropython,SHA2017-badge/micropython-esp32,blazewicz/micropython,HenrikSolver/micropython,tralamazza/micropython,henriknelson/micropython,pramasoul/micropython,adafruit/micropython,deshipu/micropython,blazewicz/micropython,alex-robbins/micropython,selste/micropython,pfalcon/micropython,oopy/micropython,ryannathans/micropython,adafruit/micropython,selste/micropython,tobbad/micropython,ryannathans/micropython,tobbad/micropython,deshipu/micropython,MrSurly/micropython,lowRISC/micropython,Timmenem/micropython,SHA2017-badge/micropython-esp32,MrSurly/micropython-esp32,adafruit/micropython,pramasoul/micropython,HenrikSolver/micropython,micropython/micropython-esp32,trezor/micropython,oopy/micropython,selste/micropython,infinnovation/micropython,TDAbboud/micropython,chrisdearman/micropython,deshipu/micropython,infinnovation/micropython,lowRISC/micropython,TDAbboud/micropython,deshipu/micropython,adafruit/circuitpython,torwag/micropython,chrisdearman/micropython,pfalcon/micropython,AriZuu/micropython,oopy/micropython,bvernoux/micropython,SHA2017-badge/micropython-esp32,PappaPeppar/micropython,adafruit/circuitpython,alex-robbins/micropython,henriknelson/micropython,PappaPeppar/micropython,alex-robbins/micropython,Timmenem/micropython,tralamazza/micropython,kerneltask/micropython,chrisdearman/micropython,bvernoux/micropython,pfalcon/micropython,pozetroninc/micropython,TDAbboud/micropython,Timmenem/micropython,micropython/micropython-esp32,HenrikSolver/micropython,selste/micropython,tralamazza/micropython,kerneltask/micropython,oopy/micropython,bvernoux/micropython,pramasoul/micropython,adafruit/micropython,alex-robbins/micropython,torwag/micropython,kerneltask/micropython,dmazzella/micropython,lowRISC/micropython,pfalcon/micropython,tobbad/micropython,adafruit/circuitpython,micropython/micropython-esp32,MrSurly/micropython,AriZuu/micropython,selste/micropython,lowRISC/micropython,deshipu/micropython,trezor/micropython,lowRISC/micropython,pfalcon/micropython,kerneltask/micropython,chrisdearman/micropython,swegener/micropython,torwag/micropython,PappaPeppar/micropython,swegener/micropython,henriknelson/micropython,adafruit/micropython,swegener/micropython,torwag/micropython