msm: csid: msm8974: Add new property for csid device

csid voltage level is different for 8974 and 8x26. Add new
property for csid vdd, parse the property in driver and use
it to power csid device. Rename mipi_csi_vdd-supply to comply
with standard.

Change-Id: I5bee2df6afca84413ab14ed8af3175d937dd1693
Signed-off-by: Su Liu <suliu@codeaurora.org>
3 files changed