Adds a reciever for pin migration data

The receiver can only be contacted by a sender with the ADD_CHOOSER_PINS
permission to prevent a 3rd party from abusing the feature to inject a
pin.

Test: atest ChooserPinMigrationReceiverTest
BUG: 223249318
Change-Id: I3d796b40c50b64848f86398e532c3e18b0937e61
3 files changed