msm: kgsl: handle larger instruction store for adreno225

This GPU has a larger instruction store, so more memory
needs to be reserved for saving shader state when context
switching.

The initial vertex and pixel partitioning of the
instruction store also needs to be different.

Change-Id: If60c06467dd30d5bae07302a74eaf2687900b2b8
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>