KVM: arm64: Move IN_GUEST_MODE ahead of state being loaded

IN_GUEST_MODE is advertised too late, when state has already been moved
onto CPU registers and cannot be observed by another CPU anymore.

Move the IN_GUEST_MODE publication ahead of the state being loaded, and
immediately check for pending request. This ensures that there is no
window of opportunity for another CPU to observe OUTSIDE_GUEST_MODE and
yet for state to be loaded.

This also simplifies the "state rollback", which solely amounts to
synchronising the timer when no irqchip is present.

Cc: stable@vger.kernel.org
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20261015100539.1011760-4-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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