msm: kgsl: Halt GBIF GX traffic for GPU with no GMU

GBIF GX traffic halt is taken care by GMU firmware
for GPU with GMU but this needs to be taken care by
HLOS driver for GPU which don't have GMU or in case
GMU is disabled. Add required support to halt GBIF
GX traffic to ensure GBIF GX traffic is halted and
all pending requests are finished before GPU reset
and power collapse.

Change-Id: Idd37d66e9a66c1166ba47ed1e3179d9a0f43ec98
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>