KVM: arm64: vhe: Drop extra isb() on guest exit

__kvm_vcpu_run_vhe() end on VHE with an isb(). However, this
function is only reachable via kvm_call_hyp_ret(), which already
contains an isb() in order to mimick the behaviour of nVHE and
provide a context synchronisation event.

We thus have two isb()s back to back, which is one too many.
Drop the first one and solely rely on the one in the helper.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>