arm64: Allow the definition of UNKNOWN system register fields

The CCSIDR_EL1 register contains an UNKNOWN field (which replaces
fields that were actually defined in previous revisions of the
architecture).

Define an 'Unkn' field type modeled after the Res0/Res1 types
to allow such description. This allows the generation of

  #define CCSIDR_EL1_UNKN     (UL(0) | GENMASK_ULL(31, 28))

which may have its use one day. Hopefully the architecture doesn't
add too many of those in the future.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Akihiko Odaki <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Oliver Upton <[email protected]>

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