drivers: udc: cleanup depends in Kconfig.dwc2

Factor out UDC_DWC2 dependency. Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>

Author: jfischer-no

drivers/usb/udc/Kconfig.dwc2

@@ -12,23 +12,22 @@ config UDC_DWC2
 help
  DWC2 USB device controller driver.
 
+if UDC_DWC2
+
 config UDC_DWC2_DMA
 bool "DWC2 USB DMA support"
 default y
-depends on UDC_DWC2
 help
  Enable Buffer DMA if DWC2 USB controller supports Internal DMA.
 
 config UDC_DWC2_HIBERNATION
 bool "DWC2 USB Hibernation support"
 default y
-depends on UDC_DWC2
 help
  Enable Hibernation if DWC2 USB controller supports hibernation.
 
 config UDC_DWC2_PTI
 bool "DWC2 USB Periodic Transfer Interrupt"
-depends on UDC_DWC2
 help
  Ignore frame number when scheduling isochronous endpoints. Use this
  when isochronous transfers should finish only after receiving token
@@ -38,24 +37,23 @@ config UDC_DWC2_PTI
 
 config UDC_DWC2_STACK_SIZE
 int "UDC DWC2 driver internal thread stack size"
-depends on UDC_DWC2
 default 512
 help
  DWC2 driver internal thread stack size.
 
 config UDC_DWC2_THREAD_PRIORITY
 int "UDC DWC2 driver thread priority"
-depends on UDC_DWC2
 default 8
 help
  DWC2 driver thread priority.
 
 config UDC_DWC2_USBHS_VBUS_READY_TIMEOUT
 int "UDC DWC2 USBHS VBUS ready event timeout in ms"
-depends on UDC_DWC2
 depends on NRFS_HAS_VBUS_DETECTOR_SERVICE
 default 0
 help
  UDC DWC2 USBHS VBUS ready event timeout. If the VBUS is not ready
  and the Nordic USBHS controller is used, the udc_enable() is
  blocked for this amount of time. Set it to zero to wait forever.
+
+endif # UDC_DWC2