msm: kgsl: Add compat ioctls feature

Makes a compat ioctl counterpart of the regular ioctl function.
Required for having 32 bit user processes to use our ioctls in a
64 bit kernel.

Change-Id: Ied23ff089ed46b3cf40c3a5e3138faf9ed6bfc64
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>