ARM: dts: msm: set 1080p as preferred mode for qcs605 and lc

Set the preferred mode of lt9611 to 1080p in case of qcs605
and qcs605-lc, because the lt9611 driver doesn't support
pluggable HDMI till now.

CRs-Fixed: 2186423
Change-Id: I32915b218e30d2545b6de6cd08317a8c96173504
Signed-off-by: Ray Zhang <rayz@codeaurora.org>