ARM: dts: msm: Increase VMEM vote for some resolutions

VMEM ab vote from video driver found to be not enough for 1080P
encode on Cobalt. Hence increase to get expected performance.

CRs-Fixed: 1054436
Change-Id: I787816f17028bea49cef3891cf4f389001b7f008
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>