beagle-xm: gpio_63 fix wrong pin initialization

DM3730 CPU used on beagleboard-xm doesn't have any gpio
multiplexed with wait0 pin,
but gpio_63 multiplexed with wait1, so it looks like typo.
At current form it has no sense,
because of wait0 have no function "4".

Signed-off-by: Evgneiy A. Dushistov <dushistov@mail.ru>