Merge "DevicePolicyManager: Support attestation for generated keys."

core/java/android/app/admin/DevicePolicyManager.java

core/java/android/app/admin/IDevicePolicyManager.aidl

keystore/java/android/security/IKeyChainService.aidl

...tore/java/android/security/keystore/AttestationUtils.java

...va/android/security/keystore/KeyAttestationException.java

...e/java/android/security/keystore/KeyGenParameterSpec.java

...c/android/security/ParcelableKeyGenParameterSpecTest.java

...rc/android/security/keystore/KeyGenParameterSpecTest.java

...android/server/devicepolicy/BaseIDevicePolicyManager.java

...droid/server/devicepolicy/DevicePolicyManagerService.java