msm: kgsl: Do not clear dispatcher fault when adreno reset fails

When adreno_reset fails, BUG_ON gets triggered to collect ram dump.
Do not clear dispatcher fault bits in such case to get correct fault
information from ram dump. Clear dispatcher fault when adreno_reset
returns success.

Change-Id: I6f54d48201d5e4ea5e3358b18d2f09ec7b285624
Signed-off-by: Pankaj Gupta <gpankaj@codeaurora.org>