ARM: dts: msm: change default mount angle and override it for v1

There is a difference in the mount angle of the sensor in 8x26 v1 and v2
targets. Change the default to the v2 mount angle and provide overrides
for v1.

Change-Id: Ic0fc8dcd094c809cbc269750fd4bdbbec36685a0
Signed-off-by: Amar Rajashekaraiah <amarr@codeaurora.org>