arm64: Add feature detection for fine grained traps

In order to allow us to have shared code for managing fine grained traps
for KVM guests add it as a detected feature rather than relying on it
being a dependency of other features.

Acked-by: Catalin Marinas <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
[maz: converted to ARM64_CPUID_FIELDS()]
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Zenghui Yu <[email protected]>
Reviewed-by: Miguel Luis <[email protected]>
Reviewed-by: Jing Zhang <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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