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Rather than exposing a whole set of helper functions to retrieve individual ID registers, use the existing decoding tree and expose a single helper instead. This allow a number of functions to be made static, and we now have a single entry point to maintain. Signed-off-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Link: https://lore.kernel.org/r/20211013120346.2926621-3-maz@kernel.org