Always fall back to factory key on any RKP error

This change cuts off the error propagation from attempting to assign or
fetch a remotely provisioned key for a given app. Instead of passing the
error back out to the framework, the error will be logged and KM will
instead use the factory provisioned key.

Bug:190645703
Test: Key generation never fails due to presence/lack of an attestation
key

Change-Id: I5234baf4649f40832798b25d3204a9a7397e457e
1 file changed