drivers: pwm: remove deprecated PWM API usage.

Removed the old PWM APIs usage and added support for the new PWM API.

JIRA: ZEP-2018

Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>