ARM: dts: msm: specify VDD_GFX CPR rev 2-7 margin adjustments for msm8996v3

Reuse the CPR revision 1 VDD_GFX CPR open-loop and closed-loop
voltage margin adjustments for all possible future CPR revisions
(i.e. 2 to 7) on MSM8996v3.x chips.  This ensures that software
can operate safely on chips that have new fuse revisions.

Change-Id: Ida041971fa5da6710b2b980ef40c9e0c6a3387bd
Signed-off-by: David Collins <collinsd@codeaurora.org>