Merge "Add KEYCODE_LAST_CHANNEL mapping to LKC KEY_LAST" am: 1710dbd097 am: c3fb05c1db am: 5dd5e5c937

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1365551

Change-Id: Ib38af6404d351410af3c66e5c4bef97bc8f3cef3