msm: kgsl: Capture gpu globals in hwsched snapshot

Capture ringbuffers, smmu info record, scratch memory and
preemption records into hw scheduling snapshot.

Change-Id: I119cc18115f3a74a6a26c976772b7d746e70900e
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>