stmhal: L4: Add support for external interrupts/events.
stmhal: L4: Add support for external interrupts/events.

The L4 MCU supports 40 Events/IRQs lines of the type configurable and
direct.  But this L4 port only supports configurable line types which are
already supported by uPy.  For details see page 330 of RM0351, Rev 1.

The USB_FS_WAKUP event is a direct type and there is no support for it.

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