nrf: Include $(SRC_MOD) in the build.
nrf: Include $(SRC_MOD) in the build.

Also, remove the unused $(SRC_LIB).

bvernoux/micropython,tobbad/micropython,henriknelson/micropython,adafruit/circuitpython,henriknelson/micropython,henriknelson/micropython,bvernoux/micropython,bvernoux/micropython,pozetroninc/micropython,pozetroninc/micropython,tobbad/micropython,pfalcon/micropython,pfalcon/micropython,trezor/micropython,selste/micropython,adafruit/circuitpython,kerneltask/micropython,pozetroninc/micropython,adafruit/circuitpython,pramasoul/micropython,henriknelson/micropython,MrSurly/micropython,trezor/micropython,pozetroninc/micropython,MrSurly/micropython,tobbad/micropython,kerneltask/micropython,adafruit/circuitpython,selste/micropython,adafruit/circuitpython,pfalcon/micropython,pramasoul/micropython,pramasoul/micropython,MrSurly/micropython,tobbad/micropython,pfalcon/micropython,pramasoul/micropython,MrSurly/micropython,kerneltask/micropython,pramasoul/micropython,selste/micropython,selste/micropython,adafruit/circuitpython,henriknelson/micropython,pfalcon/micropython,kerneltask/micropython,kerneltask/micropython,trezor/micropython,pozetroninc/micropython,tobbad/micropython,trezor/micropython,selste/micropython,bvernoux/micropython,bvernoux/micropython,MrSurly/micropython,trezor/micropython