ARM: dts: msm: Correct mount angle for rear sensor on sdm845

Fix inverted preview with proper rear sensor mount angle on
sdm845 MTP device.

Change-Id: Icd130a41d02de800d2f29d47545b7e8bf0f16a77
Signed-off-by: Viswanadha Raju Thotakura <viswanad@codeaurora.org>