Merge "Split MOUNT_FLAG_VISIBLE into MOUNT_FLAG_VISIBLE_FOR_{READ, WRITE}" am: b6f19328d5 am: 5dc7e50d24 am: 66536ae4f7

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1891615

Change-Id: Ia9706ddd9ef79a1921e8413dca94ec5d96261e24