nrf/uart: Remove unused machine.UART() parameters.
nrf/uart: Remove unused machine.UART() parameters.

If needed these parameters can be added back and made functional one at a
time.  It's better to explicitly not support them than to silently allow
but ignore them.

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