KVM: arm64: Simplify FIXED_VALUE handling

The FIXED_VALUE qualifier (mostly used for HCR_EL2) is pointlessly
complicated, as it tries to piggy-back on the previous RES0 handling
while being done in a different phase, on different data.

Instead, make it an integral part of the RESx computation, and allow
it to directly set RESx bits. This is much easier to understand.

It also paves the way for some additional changes to that will allow
the full removal of the FIXED_VALUE handling.

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-11-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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