Merge "Keystore 2.0: Add keystore engine grant string convenience functions." am: 4da629d9be am: 7e74123b72 am: 6776c214d2

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1569501

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7f2ba849f84956b95caa9d7b32e3967bafb99c18