Revert "RP2040: restore GPIO15 functionality after USB_DEVICE_ENUMERATION_FIX"

This reverts commit 4932950.

Author: facchinm

targets/TARGET_RASPBERRYPI/TARGET_RP2040/USBPhy_RP2040.cpp

@@ -32,7 +32,6 @@ extern "C" {
 
 #ifdef PICO_RP2040_USB_DEVICE_ENUMERATION_FIX
 #include "rp2040_usb_device_enumeration.h"
-#include "hardware/structs/iobank0.h"
 #endif
 
 #ifdef __cplusplus
@@ -406,13 +405,7 @@ void USBPhyHw::process()
 
         // This is required, but having trouble working out how to link in
 #ifdef PICO_RP2040_USB_DEVICE_ENUMERATION_FIX
-        const uint dp = 15;
-        auto function = gpio_get_function(dp);
-        auto override = iobank0_hw->io[dp].ctrl;
         rp2040_usb_device_enumeration_fix();
-        gpio_set_function(dp, function);
-        gpio_set_inover(dp, GPIO_OVERRIDE_HIGH);
-        hw_set_bits(&iobank0_hw->io[dp].ctrl, override);
 #endif
 
         // reset bus for USBDevice layer