gpio: mchp_xec: fix glitch setting pin to output

A GPIO's parallel output bit in the parallel output
registers is read-only until the AOD bit is set to 1
in the pin's control registers. The proper sequence to
preset the state of an output pin is:
Configure pin as input with AOD=1 in the control register
Set pin state in the parallel output register
Set direction to output in the pin's control register.

Signed-off-by: Scott Worley <scott.worley@microchip.com>