nrf/drivers: Use mp_raise_msg where appropriate, and shorten exc msgs.
nrf/drivers: Use mp_raise_msg where appropriate, and shorten exc msgs.

If the exception doesn't need printf-style formatting then calling
mp_raise_msg is more efficient.  Also shorten exception messages to match
style in core and other ports.

pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython,pfalcon/micropython