Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/arm/boot/dts/at91sam9g25.dtsi b/arch/arm/boot/dts/at91sam9g25.dtsi
index 0898213..d2f13af 100644
--- a/arch/arm/boot/dts/at91sam9g25.dtsi
+++ b/arch/arm/boot/dts/at91sam9g25.dtsi
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * at91sam9g25.dtsi - Device Tree Include file for AT91SAM9G25 SoC
  *
  * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
- *
- * Licensed under GPLv2.
  */
 
 #include "at91sam9x5.dtsi"
@@ -26,6 +25,10 @@
 				       0x003fffff 0x003f8000 0x00000000  /* pioD */
 				      >;
 			};
+
+			pmc: pmc@fffffc00 {
+				compatible = "atmel,at91sam9g25-pmc", "atmel,at91sam9x5-pmc", "syscon";
+			};
 		};
 	};
 };