KVM: arm64: Don't skip per-vcpu NV initialisation

KVM: arm64: Don't skip per-vcpu NV initialisation

Some GICv5-related rework have resulted in the NV sanitisation of
registers being skipped for secondary vcpus, which is a pretty bad
idea.

Hoist the NV init early so that it is always executed.

Reviewed-by: Sascha Bischoff <sascha.bischoff@arm.com>
Fixes: cbd8c958be54a ("KVM: arm64: Return early from kvm_finalize_sys_regs() if guest has run")
Link: https://sashiko.dev/#/patchset/20260319154937.3619520-1-sascha.bischoff%40arm.com
Link: https://patch.msgid.link/20260401103611.357092-3-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>