msm: kgsl: Restore default clock control during A3XX GMEM restore

CL contexts turn off the VPC block while running to avoid a hang.  The
VPC block needs to be turned back on before any GL calls. This includes
GMEM restore, so set the clock control value back to the original default
before doing any other operations.

CRs-fixed: 363922
Change-Id: Ic0dedbad6b031ccd9c0816013b75ba9effb18fcb
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>