drivers: gpio: porting sx1508q to msm-3.18

sx1508q gpio is needed to support ethernet
over SPI. Make changes to port the changes
from 3.10 to 3.18.

Change-Id: If3ab2f889299d9ab5a7dd1016da66c7498e4c3e9
Acked-by: Zakir Syed <zhossain@qti.qualcomm.com>
Signed-off-by: Vijay Navnath Kamble <vkambl@codeaurora.org>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>