msm: devices-msm7x27a: changes for GPS gpio

GPS gpio will be accessed from user space application to
turn on/off the external GPS chip. The GPIO needs to be
configured as an output pin using tlmm config. Changed the
direction of the pin as an input and exported for the user
space to configure as output and control the pin.

Change-Id: I5453f86d41cf9345017db8fd291838c9f17d0b73
Signed-off-by: Taniya Das <tdas@codeaurora.org>