Merge "Camera: Add black test pattern mode for privacy" into sc-dev am: 280db033 am: 348d89f7 am: 0db56a91

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14752379

Change-Id: I2eccc7199bf4a7c02a537f516fda3d2e6a838397