shared/tinyusb: Fix build errors with CDC support disabled.

This commit makes possible building MicroPython with USB CDC support
disabled.

The original code does support such a configuration but missed a few
spots where build errors would arise.  These changes fix the remaining
issues, fixing also warnings caused by the changes needed to make the
build succeed.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

shared/tinyusb/mp_usbd.h

@@ -38,13 +38,16 @@
 #ifndef NO_QSTR
 #include "tusb.h"
 #include "device/dcd.h"
+#include "class/cdc/cdc_device.h"
 #endif
 
 // Initialise TinyUSB device.
 static inline void mp_usbd_init_tud(void) {
     tusb_init();
+    #if MICROPY_HW_USB_CDC
     tud_cdc_configure_fifo_t cfg = { .rx_persistent = 0, .tx_persistent = 1 };
     tud_cdc_configure_fifo(&cfg);
+    #endif
 }
 
 // Run the TinyUSB device task

shared/tinyusb/mp_usbd_runtime.c

@@ -267,9 +267,11 @@ static uint16_t runtime_dev_open(uint8_t rhport, tusb_desc_interface_t const *it
     }
 
     // If TinyUSB built-in drivers are enabled, don't claim any interface in the built-in range
+    #if USBD_ITF_BUILTIN_MAX > 0
     if (mp_usb_device_builtin_enabled(usbd) && itf_desc->bInterfaceNumber < USBD_ITF_BUILTIN_MAX) {
         return 0;
     }
+    #endif
 
     // Determine the total descriptor length of the interface(s) we are going to claim
     uint8_t assoc_itf_count = _runtime_dev_count_itfs(itf_desc);