Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
index 019e1e2..9e99f29 100644
--- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
+++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
@@ -36,3 +36,13 @@
 Contact:	"AceLan Kao" <acelan.kao@canonical.com>
 Description:
 		Resume on lid open. 1 means on, 0 means off.
+
+What:		/sys/devices/platform/<platform>/fan_boost_mode
+Date:		Sep 2019
+KernelVersion:	5.3
+Contact:	"Yurii Pavlovskyi" <yurii.pavlovskyi@gmail.com>
+Description:
+		Fan boost mode:
+			* 0 - normal,
+			* 1 - overboost,
+			* 2 - silent