This replaces AEK_CRYPTO in the AArch64TargetParser definitions, replacing the composite Crypto features with the constituent parts. AEK_CRYPTO is replaced with either AEK_AES | AEK_SHA2 or AEK_AES | AEK_SHA2 | AEK_SHA3 | AEK_SHA4 depending on if the cpu is Arm-v8.4+. This helps get the features correct in some more places like target("cpu=..") attributes.
Otherwise this is hopefully an NFC for -mcpu options but seems like a cleaner design.