avr32: re-instate MCI WP/CD pin assignments for ATNGW100

The MRMT1 patch mistakenly reverted commit
fe272b5b

.

This new patch is intended to correct this, so that both daughtercards
should be able to assign GPIO PC25 and PE0 to the MCI driver.

Signed-off-by: Peter Ma <pma@mediamatech.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>