[USB] CDC Desc update Class/SubClass to 02

See https://www.usb.org/defined-class-codes

Well documented for Win10:
https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-driver-installation-based-on-compatible-ids

 * If you want to load Usbser.sys automatically, set the class code to 02
and subclass code to 02 in the Device Descriptor.
For more information, see USB communications device class (or USB CDC)
Specification found on the USB DWG website. With this approach,
you are not required to distribute INF files for your device because the
system uses Usbser.inf.
 * If your device specifies class code 02 but a subclass code value other
than 02, Usbser.sys does not load automatically. Pnp Manager tries to find
a driver. If a suitable driver is not found, the device might not have a
driver loaded. In this case, you might have to load your own driver or
write an INF that references another in-box driver.
 * If your device specifies class and subclass codes to 02, and you want
to load another driver instead of Usbser.sys, you have to write an INF
that specifies the hardware ID of the device and the driver to install.
For examples, look through the INF files included with sample drivers and
find devices similar to your device. For information about INF sections,
see Overview of INF Files.


Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

cores/arduino/stm32/usb/usbd_desc.c

@@ -136,8 +136,8 @@ __ALIGN_BEGIN uint8_t USBD_CDC_DeviceDesc[USB_LEN_DEV_DESC] __ALIGN_END = {
   USB_DESC_TYPE_DEVICE,       /* bDescriptorType */
   0x00,                       /* bcdUSB */
   0x02,
-  0x00,                       /* bDeviceClass */
-  0x00,                       /* bDeviceSubClass */
+  0x02,                       /* bDeviceClass */
+  0x02,                       /* bDeviceSubClass */
   0x00,                       /* bDeviceProtocol */
   USB_MAX_EP0_SIZE,           /* bMaxPacketSize */
   LOBYTE(USBD_VID),           /* idVendor */