msm: kgsl: If adreno start fails then restore state of device

Restore the state of the device back to what it was at the
start of the adreno_start function if this function fails to
execute successfully.

Change-Id: I5b279e5186b164d3361fba7c8f8d864395b794c8
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>