gd32f4xx: can: Move preprocessor conflicts to src files

The GigaDevices CAN driver uses similar names defined in Zephyr.  This
moves conflicts to source files.

Signed-off-by: HaiLong Yang <[email protected]>

Author: cameled

GD32F4XX/standard_peripheral/Include/gd32f4xx_can.h

@@ -593,12 +593,6 @@ typedef enum
 
 #define CAN_STATE_PENDING                  ((uint32_t)0x00000000U)      /*!< CAN pending */
 
-/* CAN communication mode */
-#define CAN_NORMAL_MODE                    ((uint8_t)0x00U)             /*!< normal communication mode */
-#define CAN_LOOPBACK_MODE                  ((uint8_t)0x01U)             /*!< loopback communication mode */
-#define CAN_SILENT_MODE                    ((uint8_t)0x02U)             /*!< silent communication mode */
-#define CAN_SILENT_LOOPBACK_MODE           ((uint8_t)0x03U)             /*!< loopback and silent communication mode */
-
 /* CAN resynchronisation jump width */
 #define CAN_BT_SJW_1TQ                     ((uint8_t)0x00U)             /*!< 1 time quanta */
 #define CAN_BT_SJW_2TQ                     ((uint8_t)0x01U)             /*!< 2 time quanta */
@@ -671,10 +665,7 @@ typedef enum
 
 /* frame type */
 #define CAN_FT_DATA                        ((uint32_t)0x00000000U)      /*!< data frame */
-#define CAN_FT_REMOTE                      ((uint32_t)0x00000002U)      /*!< remote frame */
-
-/* CAN timeout */
-#define CAN_TIMEOUT                        ((uint32_t)0x0000FFFFU)      /*!< timeout value */
+#define CAN_FT_REMOTE                      ((uint32_t)0x00000002U)      /*!< remote frame */ 
 
 /* interrupt enable bits */
 #define CAN_INT_TME                        CAN_INTEN_TMEIE              /*!< transmit mailbox empty interrupt enable */

GD32F4XX/standard_peripheral/Source/gd32f4xx_can.c

@@ -38,6 +38,15 @@ OF SUCH DAMAGE.
 
 #include "gd32f4xx_can.h"
 
+/* CAN communication mode */
+#define CAN_NORMAL_MODE                    ((uint8_t)0x00U)             /*!< normal communication mode */
+#define CAN_LOOPBACK_MODE                  ((uint8_t)0x01U)             /*!< loopback communication mode */
+#define CAN_SILENT_MODE                    ((uint8_t)0x02U)             /*!< silent communication mode */
+#define CAN_SILENT_LOOPBACK_MODE           ((uint8_t)0x03U)             /*!< loopback and silent communication mode */
+
+/* CAN timeout */
+#define CAN_TIMEOUT                        ((uint32_t)0x0000FFFFU)      /*!< timeout value */
+
 #define CAN_ERROR_HANDLE(s)     do{}while(1)
 
 /*!