LTE : support MEIG SLM750

Change-Id: I26a19c3a9530bc97c648ee762d5d22cf31474bcb
Reviewed-on: https://tp-biosrd-v02/gerrit/81512
Reviewed-by: Yuehtsang Li(李岳蒼) <Yuehtsang_Li@asus.com>
Tested-by: Yuehtsang Li(李岳蒼) <Yuehtsang_Li@asus.com>

Author: ennice_yang

drivers/usb/serial/option.c

@@ -93,6 +93,11 @@ static void option_instat_callback(struct urb *urb);
 #define QUANTA_PRODUCT_GKE			0xEA05
 #define QUANTA_PRODUCT_GLE			0xEA06
 
+/* MEIG PRODUCTS */
+
+#define SIGNAL_VENDOR_ID                        0x05c6
+#define SIGNAL_PRODUCT_ID                       0XF601
+
 #define NOVATELWIRELESS_VENDOR_ID		0x1410
 
 /* YISO PRODUCTS */
@@ -599,6 +604,7 @@ static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE(QUANTA_VENDOR_ID, QUANTA_PRODUCT_GLE) },
 	{ USB_DEVICE(QUANTA_VENDOR_ID, 0xea42),
 	  .driver_info = RSVD(4) },
+	{ USB_DEVICE(SIGNAL_VENDOR_ID, SIGNAL_PRODUCT_ID) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c05, USB_CLASS_COMM, 0x02, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c1f, USB_CLASS_COMM, 0x02, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c23, USB_CLASS_COMM, 0x02, 0xff) },