ARM: dts: msm: add histogram feature DT entry for SDM670

Add histogram feature DT entry for SDM670 target, which will
be used by display postprocess functions.

Change-Id: I4597d99814ebca42015cdb6415685dd8dc8d5c12
Signed-off-by: Xu Yang <yangxu@codeaurora.org>
1 file changed