Add pullup to USB interrupt line

- A pullup on the INT pin is required when the pin is level-active

Marlin/src/sd/usb_flashdrive/usb_host.cpp

@@ -109,8 +109,8 @@ bool MAX3421e::reset() {
 bool MAX3421e::start() {
   // Initialize pins and SPI bus
 
-  SET_OUTPUT(SDSS);
-  SET_INPUT(USB_INTR_PIN);
+  SET_OUTPUT(USB_CS_PIN);
+  SET_INPUT_PULLUP(USB_INTR_PIN);
   ncs();
   spiBegin();