drivers: adc: adc_mcux_adc16: improving configurability
drivers: adc: adc_mcux_adc16: improving configurability

This change enables configuration of bit resolution of the adc mcux
adc16.

Signed-off-by: Nicolai Glud <99fe77d021fa746ce1775451a7f8a9b2451258e4@prevas.dk>

zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,finikorg/zephyr,explora26/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,ldts/zephyr,ldts/zephyr,Vudentz/zephyr,ldts/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,explora26/zephyr,punitvara/zephyr,explora26/zephyr,Vudentz/zephyr,explora26/zephyr,nashif/zephyr,punitvara/zephyr,ldts/zephyr,galak/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,punitvara/zephyr