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To enable AARCH64 native instruction support for Openssl, some interfaces must be implemented. OPENSSL_cpuid_setup() allows to probe the supported features of the platform. Add ArmReadIdAA64Isar0Reg() to read the AA64Isar0, containing Arm64 instruction capabilities. A similar ArmReadIdAA64Isar0() function is available in the ArmPkg, but the CryptoPkg where OPENSSL_cpuid_setup will reside cannot rely on the ArmPkg. Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>