msm: kgsl: Update a660 CP indexed register ranges

A660 indexed register ranges have changed, so update snapshot
to dump the new ranges. It is safe to dump the entire range
across all a6x tiers. Also add the easier work around for
dumping mvc registers via mempool indexed registers.

Change-Id: I2491c35a43e6467240bab380136dc1a14f16cb27
Signed-off-by: Harshdeep Dhatt <hdhatt@codeaurora.org>