Merge "API and boot image updates to import RI BigInteger" am: 47ce951f33 am: 2996c1be22 am: 7949fea1f9

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1331800

Change-Id: I819029d39b513cd6b2bef7158ae3e5dc0967be80