msm: kgsl: Increase the wrap around constant while comparing timestamps

The wrap around value while comparing timestamps determines whether
the smaller timestamp value has wrapped around or not. Increase this
value as we are hitting cases where we detect a wrap around condition but
in reality the timestamp has not yet wrapped around.

Change-Id: I2dfbebf94468ec8895536214c81fc22ef62212ae
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>