Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index 7515a19..850c93f 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -128,6 +128,6 @@
 
 void __init xen_init_irq_ops(void)
 {
-	pv_irq_ops = xen_irq_ops;
+	pv_ops.irq = xen_irq_ops;
 	x86_init.irqs.intr_init = xen_init_IRQ;
 }