msm: kgsl: Use irqsave/irqrestore for cmdbatch locks

Because the cmdbatch spin lock can be taken in a timer we need
to protect ourselves by turning off interrupts for a bit in
in the various places the lock is taken during nominal operation.

Change-Id: Ic0dedbad3eedba9427933eb5b3ea359f05a018b1
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>