ArmReadIdPfr0 is now used only inside ArmLib. Rename the AArch64 variant ArmReadIdAA64Pfr0 and add a declaration of that only into local header AArch64/AArch64Lib.h. Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Signed-off-by: Leif Lindholm <leif@nuviainc.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>