Add libdepthphoto to mainline_system

Used by depth composite stream in camera
service.

Bug: 132173732
Test: make,
runtest -x
cts/tests/camera/src/android/hardware/camera2/cts/ImageReaderTest.java
-m testDynamicDepth
runtest -x
cts/tests/camera/src/android/hardware/camera2/cts/ExtendedCameraCharacteristicsTest.java
-m testDepthOutputCharacteristics
runtest -x
cts/tests/camera/src/android/hardware/camera2/cts/NativeImageReaderTest.java
-m testDepthJpeg

Change-Id: I1357f8ab09cdd9bc43317ea0d50537e1f9ef8d7a