fix enum walkaround forever check for SE0 when pull up is disabled

src/portable/raspberrypi/rp2040/rp2040_usb.c

@@ -60,8 +60,11 @@ void rp2040_usb_init(void)
     memset(usb_hw, 0, sizeof(*usb_hw));
     memset(usb_dpram, 0, sizeof(*usb_dpram));
 
-    // Mux to phy
+    // Mux the controller to the onboard usb phy
     usb_hw->muxing    = USB_USB_MUXING_TO_PHY_BITS    | USB_USB_MUXING_SOFTCON_BITS;
+
+    // Force VBUS detect so the device thinks it is plugged into a host
+    // TODO support VBUs detect
     usb_hw->pwr       = USB_USB_PWR_VBUS_DETECT_BITS  | USB_USB_PWR_VBUS_DETECT_OVERRIDE_EN_BITS;
 }