[nrf fromlist] drivers: pwm: fixes for fast PWM120#2415

bjarki-andreasen merged 2 commits intonrfconnect:mainnrfconnect/sdk-zephyr:mainfrom

mstasiaknordic:pwm_hsfll_fixmstasiaknordic/sdk-zephyr:pwm_hsfll_fixCopy head branch name to clipboard