defconfig: msm7627a: Enable GPIO regulator driver

Enable the GPIO regulator driver for addressing the external
shared GPIO regulator control

Change-Id: I0eb594d2da6b3610545358ea3ee61ba2fdb84282
Signed-off-by: Trilok Soni <tsoni@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>