msm: kgsl: Ensure retention is set before slumber

Set the retention bit for the GX domain before turning
off the HM or SPTP head switches.

CRs-Fixed: 2017390
Change-Id: I8efe90a0eedc7419febb559c0aa93d6c30235e3c
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
2 files changed