ARM: dts: msm: Disable clock gating feature on 8939 targets

Clock gating between inter frames when video hardware
is in IDLE state is not giving any power savings and
at the same time this feature is resulting in few stability
issues. So disabling clock gating feature on 8939 targets.

Change-Id: Ibf6fed65e02592fbb9f0cd825a83bf6f7481449e
Signed-off-by: Srinu Gorle <sgorle@codeaurora.org>