msm: kgsl: use correct 2d ringbuffer offset in resume

The 2d timestamp is used as an index into the ringbuffer.
Now that z180_dev->current_timestamp is preserved across
resume, make sure that ADDR_VGV3_NEXTADDR is set to the
gpu address that corresponds to the current timestamp.

CRs-Fixed: 347025
Change-Id: Ib7dc4579943ab24e04279ede1555539ec21adabd
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
Merge "msm: kgsl: use correct 2d ringbuffer offset in resume" into jb_chocolate