msm: camera: enable gc0339 driver for msm8x12 qrd board

Since gc0339 has no reset pin in msm8x12 qrd board,
before operate on the gpio, a nonzero check is necessary.

Change-Id: Ic87698a1369056b2ce72c0f20fb2dca0ed1ef7a9
Signed-off-by: Li Sun <sunli@codeaurora.org>