i8k: uapi: Introduce define for new highest fan speed

Some Dell laptops support fan speeds of {0, 1, 2, 3} instead of {0, 1, 2}.
Add a define for it.
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Cc: Andreas Mohr <andi@lisas.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

include/uapi/linux/i8k.h

@@ -34,7 +34,8 @@
 #define I8K_FAN_OFF		0
 #define I8K_FAN_LOW		1
 #define I8K_FAN_HIGH		2
-#define I8K_FAN_MAX		I8K_FAN_HIGH
+#define I8K_FAN_TURBO		3
+#define I8K_FAN_MAX		I8K_FAN_TURBO
 
 #define I8K_VOL_UP		1
 #define I8K_VOL_DOWN		2