xpedite1k: Add support for additional GPIO pins

Enable GPIO pins for an I2C EEPROM write protect, a system reset pin,
and a PMC #MONARCH pin.  These pins are not currently used in U-Boot,
but are used in OSes and may be used in U-Boot in the future.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Stefan Roese <sr@denx.de>