[bsp] Prevent compilation errors in bxcan.c when using STM32F10X_LD_VL,STM32F10X_MD_VL,STM32F10X_HD_VL incorrectly choose to use the RT_USING_CAN.
#include <board.h>
#include <bxcan.h>
+#if (defined (STM32F10X_LD_VL)) || (defined (STM32F10X_MD_VL)) || (defined (STM32F10X_HD_VL))
+#undef RT_USING_CAN
+#endif
+
#ifdef RT_USING_COMPONENTS_INIT
#include <components.h>
#endif
