KVM: arm64: nv: Add fine grained trap forwarding infrastructure

Fine Grained Traps are fun. Not.

Implement the fine grained trap forwarding, reusing the Coarse Grained
Traps infrastructure previously implemented.

Each sysreg/instruction inserted in the xarray gets a FGT group
(vaguely equivalent to a register number), a bit number in that register,
and a polarity.

It is then pretty easy to check the FGT state at handling time, just
like we do for the coarse version (it is just faster).

Reviewed-by: Eric Auger <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Jing Zhang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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