ARM: dts: msm: Add the CX MISC GPU block on sdmmagpie

The CX MISC GPU register block is used for a few configuration
settings. Add this block in the devicetree files for sdmmagpie.

Change-Id: I3884a6d3f8c66ad8aadd52005be3666b464a8d7b
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>