platform/x86: thinkpad_acpi: Add support for new hotkeys found on X1C8 / T14

New Lenovo Thinkpad models, e.g. the X1 Carbon 8th gen and the new T14 gen1
models have 3 new symbols / shortcuts on their F9-F11 keys (and the
thinkpad_acpi driver receives 3 new hkey events for these):

F9:  Has a symbol resembling a rectangular speech balloon, the manual says
     the hotkey functions shows or hides the notification center
F10: Has a symbol of a telephone horn which has been picked up from the
     receiver, the manual says: "Answer incoming calls"
F11: Has a symbol of a telephone horn which is resting on the receiver,
     the manual says: "Decline incoming calls"

And these Thinkpad models also send a new 0x1316 hkey events when the
Fn + right Shift key-combo is pressed.

This commit adds support for these 4 new hkey events.
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200908135147.4044-4-hdegoede@redhat.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/platform/x86/thinkpad_acpi.c

@@ -1930,6 +1930,10 @@ enum {	/* hot key scan codes (derived from ACPI DSDT) */
 	TP_ACPI_HOTKEYSCAN_CALCULATOR,
 	TP_ACPI_HOTKEYSCAN_BLUETOOTH,
 	TP_ACPI_HOTKEYSCAN_KEYBOARD,
+	TP_ACPI_HOTKEYSCAN_FN_RIGHT_SHIFT, /* Used by "Lenovo Quick Clean" */
+	TP_ACPI_HOTKEYSCAN_NOTIFICATION_CENTER,
+	TP_ACPI_HOTKEYSCAN_PICKUP_PHONE,
+	TP_ACPI_HOTKEYSCAN_HANGUP_PHONE,
 
 	/* Hotkey keymap size */
 	TPACPI_HOTKEY_MAP_LEN
@@ -3450,7 +3454,11 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
 		KEY_RESERVED,			/* Clipping tool */
 		KEY_CALC,			/* Calculator (above numpad, P52) */
 		KEY_BLUETOOTH,			/* Bluetooth */
-		KEY_KEYBOARD         /* Keyboard, 0x315 */
+		KEY_KEYBOARD,			/* Keyboard, 0x315 */
+		KEY_FN_RIGHT_SHIFT,		/* Fn + right Shift */
+		KEY_NOTIFICATION_CENTER,	/* Notification Center */
+		KEY_PICKUP_PHONE,		/* Answer incoming call */
+		KEY_HANGUP_PHONE,		/* Decline incoming call */
 		},
 	};