cameraservice_test: Add DepthProcessorTest to the host build.

DepthProcessorTest depends on libdynamic_depth and lib_image_io, which
up until now have had no host build. The topic-related patches add the
host_supported flag to both of them.

Some additions have been made to NVCompressor.h and DepthPhotoProcessor.cpp
to build successfully on the host. These have minimal impact.

Bug: 207411352
Test: Ran test on gLinux.
Change-Id: Ifa3a5f93690c7d4c5c6898dfd7370f090037fc37