stm32cube: add missing include guards for stm32g0xx_hal_hcd.h

The content of stm32g0xx_hal_hcd.h should be included only
on devices where the usb peripheral is available,
but this is not the case in STM32CubeG0 v1.4.0 release.
This commit fixes that issue.

Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>

stm32cube/stm32g0xx/README

@@ -39,5 +39,6 @@ Patch List:
    *Changes from official delivery:
     -dos2unix applied
     -trailing white spaces removed
+    -added include guards to stm32g0xx_hal_hcd.h(STM32CubeG0 GH issue: 13)
 
    See release_note.html from STM32Cube

stm32cube/stm32g0xx/drivers/include/stm32g0xx_hal_hcd.h

@@ -28,7 +28,7 @@ extern "C" {
 /* Includes ------------------------------------------------------------------*/
 #include "stm32g0xx_ll_usb.h"
 
-
+#if defined (USB_DRD_FS)
 /** @addtogroup STM32G0xx_HAL_Driver
   * @{
   */
@@ -487,7 +487,7 @@ HAL_StatusTypeDef  HAL_HCD_PMAReset(HCD_HandleTypeDef *hhcd);
  /**
   * @}
   */
-
+#endif /* defined (USB_DRD_FS) */
 
 #ifdef __cplusplus
 }