drivers: udc: stm32: add kconfig dependency on !USB_DC_STM32

If both new and old stm32 usb drivers are enabled, the HAL callbacks
will raise multiple definition linker errors.  By adding this kconfig
dependency, this will be reported as a kconfig warning that should be
easier to understand.  This will happen when trying to run samples with
-DCONF_FILE=usbd_next_prj.conf for boards that automatically enable the
legacy usb stack (e.g. arduino_portenta/stm32h747xx/m7).

Signed-off-by: Tobias Pisani <[email protected]>

drivers/usb/udc/Kconfig.stm32

@@ -6,6 +6,7 @@ config UDC_STM32
 	depends on DT_HAS_ST_STM32_OTGFS_ENABLED \
 		|| DT_HAS_ST_STM32_OTGHS_ENABLED \
 		|| DT_HAS_ST_STM32_USB_ENABLED
+	depends on !USB_DC_STM32
 	select USE_STM32_LL_USB
 	select USE_STM32_HAL_PCD
 	select USE_STM32_HAL_PCD_EX