system(C0): update STM32C0xx system

Remove duplicate clock definition.
Allow VECT_TAB_OFFSET redefinition.

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

Author: fpistm

system/STM32C0xx/system_stm32c0xx.c

@@ -45,22 +45,6 @@
 
 #include "stm32c0xx.h"
 
-#if !defined  (HSE_VALUE)
-#define HSE_VALUE    (48000000UL)    /*!< Value of the External oscillator in Hz */
-#endif /* HSE_VALUE */
-
-#if !defined  (HSI_VALUE)
-  #define HSI_VALUE  (48000000UL)   /*!< Value of the Internal oscillator in Hz*/
-#endif /* HSI_VALUE */
-
-#if !defined  (LSI_VALUE)
- #define LSI_VALUE   (32000UL)     /*!< Value of LSI in Hz*/
-#endif /* LSI_VALUE */
-
-#if !defined  (LSE_VALUE)
-  #define LSE_VALUE  (32768UL)      /*!< Value of LSE in Hz*/
-#endif /* LSE_VALUE */
-
 /**
   * @}
   */
@@ -81,8 +65,10 @@
 /*!< Uncomment the following line if you need to relocate your vector Table in
      Internal SRAM. */
 //#define VECT_TAB_SRAM
+#ifndef VECT_TAB_OFFSET
 #define VECT_TAB_OFFSET  0x0U /*!< Vector Table base offset field.
                                    This value must be a multiple of 0x100. */
+#endif
 /******************************************************************************/
 /**
   * @}