msm: kgsl: Do not overwrite dispatcher fault

Do not overwrite the fault in dispatcher but add
the fault type and let the fault handler decide how
to deal in multiple faults. And after fault handling
there is a possibility that the fault bit will still
be set if the fault timer fires when fault handler
is running. Ignore that fault by clearing fault bit
after reset in fault handler.

Change-Id: I7b240fb55378cb30092a93adf7feca20eaca7568
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>