quantum: util: add bit and bitmask helpers
These helpers are handy and can prevent off-by-one errors when working
with registers and general low level bit manipulation tasks. The macros
themself are inspired by the bits.h macros from the linux kernel source
code.
Signed-off-by: Stefan Kerkmann <karlk90@pm.me>
Co-authored-by: Pascal Getreuer <50221757+getreuer@users.noreply.github.com>
