ARM: dts: msm: add camera configuration for sdm845 rb3 device

Add ov8856 configuration that is required for camera functionality
on sdm845 rb3. While at it, remove the device nodes that are not required.

Change-Id: Ie1a0768dce354d06bfb752f57655796932f6bbc4
Signed-off-by: Zhaohong Chen <zhaohong@codeaurora.org>