msm: kgsl: Read A6XX non-context registers directly

The A6XX non-context debug registers on A6XX can be read directly,
either through the crashdumper script, or through AHB. Treat these as
other ordinary registers that don't require special handling.

Change-Id: I5ba5deb470b10d92e145a4532c3850490ecf224e
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>