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This change adds an AIDL interface which the RemoteProvisioner app
implements that allows the keystore SPI to inform the app when an
attestation key may have been used, and when the underlying attestation
key pool is totally empty. The former is a non-blocking call, and the
latter blocks until completion.
Since the latter involves network, there are timeouts involved on the
app side to ensure that the blocking call doesn't hang indefinitely if
there's no network.
Test: atest CtsKeystoreTestCases && atest RemoteProvisionerUnitTests
Change-Id: Ie49e37659c96ce5c1626d1b99a4a7ccc62028156
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