libhwc2.1: Add HistogramController class am: 573d3753c8

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/google/graphics/zuma/+/23655883

Change-Id: Ifd6df2c26d223278189136d6f83359e7e674a417
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>