msm: kgsl: Do not return error if there is no GMU

If there is no GMU but oob_set is called, return 0
instead of returning error. This simplifies the code.

CRs-Fixed: 2017390
Change-Id: I52bdb82d4cc6972277ddfde061a79262a56e731e
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>
1 file changed