drivers/usbdev_synopsys_dwc2: disable DMA mode

DMA mode is disabled for now due to several problems:
 - The STALL bit of the OUT control endpoint does not seem to be cleared automatically on the next SETUP received. At least the USB OTG HS core does not generate an interrupt on the next SETUP received. This happens, for example, when CDC ACM is used and the host sends the SET_LINE_CODING request. In this case the enumeration of further interfaces, for example CDC ECM is stopped.
- The Enumeration fails for CDC ECM interface which uses URB support.

drivers/usbdev_synopsys_dwc2/usbdev_synopsys_dwc2.c

@@ -211,7 +211,15 @@ static size_t _max_endpoints(const dwc2_usb_otg_fshs_config_t *config)
 
 static bool _uses_dma(const dwc2_usb_otg_fshs_config_t *config)
 {
-#if defined(DWC2_USB_OTG_HS_ENABLED) && STM32_USB_OTG_HS_USE_DMA
+/* DMA mode is disabled for now due to several problems:
+ * - The STALL bit of the OUT control endpoint does not seem to be cleared
+ *   automatically on the next SETUP received. At least the USB OTG HS core
+ *   does not generate an interrupt on the next SETUP received. This happens,
+ *   for example, when CDC ACM is used and the host sends the SET_LINE_CODING
+ *   request. In this case the enumeration of further interfaces, for example
+ *   CDC ECM is stopped.
+ * - The Enumeration fails for CDC ECM interface which uses URB support. */
+#if 0 /* defined(DWC2_USB_OTG_HS_ENABLED) && STM32_USB_OTG_HS_USE_DMA */
     return config->type == DWC2_USB_OTG_HS;
 #else
     (void)config;