msm: kgsl: Add new debugbus and clusters to a650 snapshot

Add the new debugbus blocks. Also, use the new VPC_PS
cluster instead of PS cluster to dump VPC PS registers.
Additionally, dump the new SP_RB_CNTL register.

Change-Id: I73a9c26911769a37ba1f579d3cf3445de0b774a0
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>