msm: kgsl: Update A6XX RSCC registers in the snapshot

There were some holes in the RSCC registers dumped into the snapshot.
Update the list of all readable RSCC regsiters to dump.

Change-Id: Ica32b66fc6a6bfbcebc4a576be4fea83bbb9d692
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>