arm/dt: camera:adjust mount angle for gc0339 sensor

Adjust the mount angle of gc0339 sensor from 90 degree to
270 degree.

Change-Id: If464c66e9a0f84fb9744991e90868352a9c77e81
CRs-Fixed: 532212
Signed-off-by: Wang Wenbin <wenbinw@codeaurora.org>