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Create a helper function to query whether ID_AA64MFR1_EL1 indicates presence of the Embedded Trace Extension (ETE). This feature is only visible in AARCH64 state. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Leif Lindholm <quic_llindhol@quicinc.com> Cc: Pierre Gondois <pierre.gondois@arm.com> Signed-off-by: Sami Mujawar <sami.mujawar@arm.com> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com> Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>