system(C0): update STM32C0xx hal default config

Allow some redefinition.

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

system/STM32C0xx/stm32c0xx_hal_conf_default.h

@@ -148,11 +148,21 @@ in voltage and temperature.*/
 /**
   * @brief This is the HAL system configuration section
   */
+#if !defined  (VDD_VALUE)
 #define  VDD_VALUE                    (3300UL) /*!< Value of VDD in mv */
+#endif
+#if !defined  (TICK_INT_PRIORITY)
 #define  TICK_INT_PRIORITY            ((1UL<<__NVIC_PRIO_BITS) - 1UL) /*!< tick interrupt priority */
+#endif
+#if !defined  (USE_RTOS)
 #define  USE_RTOS                     0U
+#endif
+#if !defined  (PREFETCH_ENABLE)
 #define  PREFETCH_ENABLE              1U
+#endif
+#if !defined  (INSTRUCTION_CACHE_ENABLE)
 #define  INSTRUCTION_CACHE_ENABLE     1U
+#endif
 
 
 /* ########################## Assert Selection ############################## */