ARM: dts: msm: add lt9611 support for qcs605 lc

qcs605 lc uses LT9611 as the DSI to HDMI bridge chip.
DSI bridge device is working like a DSI client so add the
device tree changes to support this bridge device.

CRs-Fixed: 2186423
Change-Id: Ic95699669231465c6a287fe37fbc52f48fe6a103
Signed-off-by: Ray Zhang <rayz@codeaurora.org>