msm: kgsl: Don't reset HFI indexes on reset

There is no need to reset HFI queue read_index and write_index
on device start/stop. They should be equal. If they are not then
log the mismatch and force them to be equal.

Change-Id: Id6dbf3f028f5a27608cc49f5ede2c76291f71669
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>