boards: arm: npcx7/9m6f_evb: remove non-essential options

According to the board porting guidelines, boards should enable
essential peripherals, such as GPIO/UART/CLOCK_CONTROL/PINCTRL, etc.
Things like PWM/ADC, etc. are not in the "essential" category.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>