KVM: arm64: nv: Rename BEHAVE_FORWARD_ANY

BEHAVE_FORWARD_ANY is slightly ambiguous, especially since we're about
to cram some more information into the enum. Rephrase it.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241025182354.3364124-8-oliver.upton@linux.dev


Signed-off-by: Oliver Upton <oliver.upton@linux.dev>