ARM: dts: msm: Correct clock name for GPU_CC_AHB_CLK on Trinket

Clock name string for GPU_CC_AHB_CLK was specified as "iface_clock"
which should be "iface_clk". Correct this to make sure driver
votes for this clock.

Change-Id: I1526bfe3ab4de1027efa4c7b6f88046783fdbeaf
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>