boards: rddrone_fmuk66 fix pwm pinmux and servos

Fixes the channel 2 PWM pinmux adds servos and PWM LEDs.
Required to operate servo motors and status lighting.
Tested on RDDRONE board.

Signed-off-by: Benjamin Perseghetti <bperseghetti@rudislabs.com>
Co-authored-by: Sumit Batra <sumit.batra@nxp.com>
Co-authored-by: Landon Haugh <landon.haugh1@gmail.com>