msm: kgsl: Get gx status on demand instead through arguments

It is more flexible to get gx status on demand.
Also dump the fault type string in fault header.

Change-Id: I73f4e9aa5f96ca434e011873251f263c20b7dcb5
Signed-off-by: Sravankumar bijili <csbijil@codeaurora.org>