HID: wacom: Add support for Pro Pen slim

Wacom has introduced a new pen compatible with its MobileStudio Pro and
other tablets. Although adding it to the tool ID tablet is not strictly
necessary  unrecognized pens are reported as BTN_TOOL_PEN already, unless
the tablet sends the "eraser" bit, when BTN_TOOL_RUBBER is used instead),
we'll keep it updated anyway.
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

drivers/hid/wacom_wac.c

@@ -626,6 +626,7 @@ static int wacom_intuos_get_tool_type(int tool_id)
 	case 0x8e2: /* IntuosHT2 pen */
 	case 0x022:
 	case 0x10804: /* Intuos4/5 13HD/24HD Art Pen */
+	case 0x10842: /* MobileStudio Pro Pro Pen slim */
 	case 0x14802: /* Intuos4/5 13HD/24HD Classic Pen */
 	case 0x16802: /* Cintiq 13HD Pro Pen */
 	case 0x18802: /* DTH2242 Pen */
@@ -667,6 +668,7 @@ static int wacom_intuos_get_tool_type(int tool_id)
 	case 0x1480a: /* Intuos4/5 13HD/24HD Classic Pen Eraser */
 	case 0x1090a: /* Intuos4/5 13HD/24HD Airbrush Eraser */
 	case 0x1080c: /* Intuos4/5 13HD/24HD Art Pen Eraser */
+	case 0x1084a: /* MobileStudio Pro Pro Pen slim Eraser */
 	case 0x1680a: /* Cintiq 13HD Pro Pen Eraser */
 	case 0x1880a: /* DTH2242 Eraser */
 	case 0x1080a: /* Intuos4/5 13HD/24HD General Pen Eraser */