KVM: arm64: nv: Always evaluate HCR_EL2 using sanitising accessors

A lot of the NV code depends on HCR_EL2.{E2H,TGE}, and we assume
in places that at least HCR_EL2.E2H is invariant for a given guest.

However, we make a point in *not* using the sanitising accessor
that would enforce this, and are at the mercy of the guest doing
stupid things. Clearly, that's not good.

Rework the HCR_EL2 accessors to use __vcpu_sys_reg() instead,
guaranteeing that the RESx settings get applied, specially
when HCR_EL2.E2H is evaluated. This results in fewer accessors
overall.

Huge thanks to Joey who spent a long time tracking this bug down.

Reported-by: Joey Gouly <Joey.Gouly@arm.com>
Tested-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20250112165029.1181056-2-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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