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Make IdentityCredentialStore.getInstance() return null if credstore is not installed.
Having this method return null is the expected and documented behavior when either the IC HAL or credstore isn't available. Test: atest android.security.identity.cts (with credstore not running) Bug: 148495024 Change-Id: Ifa17c58a84057499b1aeb8404959d5c0badfe52a