Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/irqchip/irq-dw-apb-ictl.c b/drivers/irqchip/irq-dw-apb-ictl.c
index 0a19618..e4550e9 100644
--- a/drivers/irqchip/irq-dw-apb-ictl.c
+++ b/drivers/irqchip/irq-dw-apb-ictl.c
@@ -105,7 +105,7 @@
 	 * DW IP can be configured to allow 2-64 irqs. We can determine
 	 * the number of irqs supported by writing into enable register
 	 * and look for bits not set, as corresponding flip-flops will
-	 * have been removed by sythesis tool.
+	 * have been removed by synthesis tool.
 	 */
 
 	/* mask and enable all interrupts */