Move objects.h to LPC11XX_11CXX common

Use #if DEVICE_CAN for can_s definition

Author: omdathetkan

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC11XX_11CXX/TARGET_LPC11XX/objects.h

@@ -59,9 +59,11 @@ struct spi_s {
     LPC_SSP_TypeDef *spi;
 };
 
+#if DEVICE_CAN
 struct can_s {
     int index;
 };
+#endif
 
 #include "gpio_object.h"