ARM: dts: msm: update VDD_GFX CPR RO scaling factors for msmcobalt v2

Update the VDD_GFX CPR regulator device RO scaling factor values
in order to match the latest hardware guidelines determined via
characterization.

Change-Id: I01f3b0d99e711a26358f9cc0bc1692a60cc74f64
CRs-Fixed: 1080409
Signed-off-by: David Collins <collinsd@codeaurora.org>