David Zeuthen a0796e98c2 Identity Credential: Restrict AccessControlProfile identifiers to 32.
In order to implement Identity Credential on resource-restricted
secure hardware, we need to limit the number of possible
AccessControlProfile in a credential. A limit of 32 means that such
hardware only need to devote four bytes of RAM for a bitmask with
information about which profiles are authorized.

Document this, add new VTS test, and update the default
implementation.

Bug: 155100967
Test: atest android.security.identity.cts
Test: atest VtsHalIdentityTargetTest
Change-Id: Ia4f2ee0013b330561df744e0595f298a0d156122
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