ARM: dts: msm: Add GPU ID and update clock plan for 8974Pro

Specify a new GPU ID and clock plan for 8974Pro.

Change-Id: I3709088df5e0ce54ab29d00751fdc04b7a9e99ee
Signed-off-by: Rama Vaddula <rvaddula@codeaurora.org>
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>