Implement 2nd IMEI attestation support

Support for attesting to a second IMEI sent by the platform:
Validate that the 2nd IMEI is the subsequent to the 1st one,
including checksum digit.

Bug: 244732345
Test: atest android.keystore.cts.DeviceOwnerKeyManagementTest
Test: build-root/build-qemu-generic-arm64-test-debug/run --headless --boot-test "com.android.keymaster-unittest"
Test: build-root/*/host_tests/keymaster_test
Change-Id: I84c2968c5e21d7228e16403aa3783dc141e4419e
8 files changed