Input: define KEY_WWAN for Wireless WAN

Some devices with support for mobile networks may have buttons for
enabling/disabling such connection. An example can be Linksys router 54G3G.
We already have KEY_BLUETOOTH, KEY_WLAN and KEY_UWB so it makes sense to
add KEY_WWAN as well.  As we already have KEY_WIMAX, use it's value for
KEY_WWAN and make it an alias.
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

include/uapi/linux/input.h

@@ -464,7 +464,8 @@ struct input_keymap_entry {
 #define KEY_BRIGHTNESS_ZERO	244	/* brightness off, use ambient */
 #define KEY_DISPLAY_OFF		245	/* display device to off state */
 
-#define KEY_WIMAX		246
+#define KEY_WWAN		246	/* Wireless WAN (LTE, UMTS, GSM, etc.) */
+#define KEY_WIMAX		KEY_WWAN
 #define KEY_RFKILL		247	/* Key that controls all radios */
 
 #define KEY_MICMUTE		248	/* Mute / unmute the microphone */