ARM: dts: msm: Fix for Display leakage in ambient mode.

DSI idle commands is missing in DT file. This fixes
Display leakage issue in ambient mode on msm8909w

Change-Id: I80a231d90f4d441c0dca33b57b92096b24417d46
Signed-off-by: Manjunatha Madana <mamanj@codeaurora.org>
Signed-off-by: Chetan C R <cravin@codeaurora.org>