KVM: arm64: Introduce data structure tracking both RES0 and RES1 bits

We have so far mostly tracked RES0 bits, but only made a few attempts
at being just as strict for RES1 bits (probably because they are both
rarer and harder to handle).

Start scratching the surface by introducing a data structure tracking
RES0 and RES1 bits at the same time.

Note that contrary to the usual idiom, this structure is mostly passed
around by value -- the ABI handles it nicely, and the resulting code is
much nicer.

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-5-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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