ARM: dts: msm: Update gpu thermal vote for VDD restriction for SDM670

Update cold temperature VDD restriction thermal vote for gpu for all
speed bins based on latest recommendation.

Change-Id: I50452cd00ca0efb9c8c4affab2b5217030a12e17
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>