ARM: dts: msm: change camera csid power supply

USB and DSI use L6, and camera csid also uses this LDO.
So need to change the power supply to meet the new range.

Change-Id: I61cf5e9a344739d9d8f6e4da77ac87ac86d6420e
Signed-off-by: Neng Chen <nengchen@codeaurora.org>