ARM: dts: msm: Update GPU clock plan for trinket

Now trinket is having single sku which supports
only 950MHz Fmax. Update the gpu clock plan and
remove the speed-bins support.

Change-Id: I391f0c416a2385e0948580ee95f94c80ca59f92a
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>