KVM: arm64: selftests: Actually enable IRQs in vgic_lpi_stress

vgic_lpi_stress rather hilariously leaves IRQs disabled for the duration
of the test. While the ITS translation of MSIs happens regardless of
this, for completeness the guest should actually handle the LPIs.

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

Author: oupton

tools/testing/selftests/kvm/arm64/vgic_lpi_stress.c

@@ -123,6 +123,7 @@ static void guest_setup_gic(void)
 static void guest_code(size_t nr_lpis)
 {
 	guest_setup_gic();
+	local_irq_enable();
 
 	GUEST_SYNC(0);