msm: kgsl: set bit 24 of CP_CHICKEN_DBG for A702

A702 HLSQ doesn't have context buffer for third context. So
set the bit 24, which is HLSQCluster3ContextDis, of
CP_CHICKEN_DBG for A702.

Change-Id: I1ca75e1725670ef65baccf3a4e6c731550b93dd7
Signed-off-by: Puranam V G Tejaswi <pvgtejas@codeaurora.org>