ARM: dts: msm: Update GPU Idle timeout and SMMU clock names for msmgold

Update GPU idle timeout to 80msec, to inline with the GPU default idle
tiemout value. Also modify the SMMU clock names to reflect the clocks.

Change-Id: I28d31d8ee81bd6abe14d61ad4548d51dee43b17a
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>