drivers: clock-control: Microchip MEC172x adjust clock based on OTP

Microchip MEC172x CPU and fast peripheral (QMSPI and PK) are
clock source is based upon an OTP setting. Add logic to adjust
clock source based on OTP value. If the OTP value is ever changed
this fix will allow calcluation of correct clock rate.

Signed-off-by: Jay Vasanth <jay.vasanth@microchip.com>