HID: add mapping for "AL Network Chat" usage

Adding a mapping for the 'AL Network Chat' usage from the 'Consumer' usage
page (USB HID Usage Tables v1.11). This usage is used by some keyboards for
a multimedia key.
Signed-off-by: Leo P White <lpw25@cam.ac.uk>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-input.c

@@ -405,6 +405,7 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 		case 0x192: map_key_clear(KEY_CALC);		break;
 		case 0x194: map_key_clear(KEY_FILE);		break;
 		case 0x196: map_key_clear(KEY_WWW);		break;
+		case 0x199: map_key_clear(KEY_CHAT);		break;
 		case 0x19c: map_key_clear(KEY_LOGOFF);		break;
 		case 0x19e: map_key_clear(KEY_COFFEE);		break;
 		case 0x1a6: map_key_clear(KEY_HELP);		break;