KVM: arm64: Add sanitisation for NVHCR_EL2

Just like any other VNCR-based register, NVHCR_EL2 requires some
level of sanitisation. Being specified as a live copy of HCR_EL2,
it adopts the exact same format, but depends on FEAT_NV3 instead.

A subtle aspect is that we only want to apply the sanitisation if
FEAT_NV3 is actually present, as the VNCR location is otherwise
used to back accesses to HCR_EL2.

Reviewed-by: Yuan Yao <yaoyuan@linux.alibaba.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260730071022.296811-21-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>

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