board-msm8x60: display: Fix writeback memory size

The default writeback size (6MB) is as per primary interface. For
mixer1 writeback to be enabled, writeback size should be more than
the maximum resolution supported by mixer1 which is 1080P.
Increase writeback memory size for mixer1 writeback to 12MB.

CRs-fixed: 329630
Change-Id: Icee8370dfc78d316eed3e78a4a7e82e3e64bfa63
Signed-off-by: Mayank Chopra <makchopra@codeaurora.org>
1 file changed