rp2: Don't advertise remote wakeup for USB serial.

This USB feature is currently not supported.  With this flag enabled (and
the feature not implemented) the USB serial will stop working if there is a
delay of more than about 2 seconds between messages, which can occur with
USB autosuspend enabled.

Fixes issue #6866.

ports/rp2/tusb_port.c

@@ -68,7 +68,7 @@ static const tusb_desc_device_t usbd_desc_device = {
 
 static const uint8_t usbd_desc_cfg[USBD_DESC_LEN] = {
     TUD_CONFIG_DESCRIPTOR(1, USBD_ITF_MAX, USBD_STR_0, USBD_DESC_LEN,
-        TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, USBD_MAX_POWER_MA),
+        0, USBD_MAX_POWER_MA),
 
     TUD_CDC_DESCRIPTOR(USBD_ITF_CDC, USBD_STR_CDC, USBD_CDC_EP_CMD,
         USBD_CDC_CMD_MAX_SIZE, USBD_CDC_EP_OUT, USBD_CDC_EP_IN, USBD_CDC_IN_OUT_MAX_SIZE),