1. Change the type of cmd to 'int';
2. Remove RT_LWIP_USING_RT_MEM macro;

[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.

[bsp] Fix a CAN interrupt number macro definition bug for STM32F10X_LD,STM32F10X_MD and STM32F10X_XL series.

[BSP] Fix component initialization functions may be not sequential storage on ROM when used for IAR linker.

function `rt_pin_write` is invoked by  function `can_bus_hook`, and it should to be initialized by gpio.c.
but gpio.c was not added in SConscript

enum CANBAUD was changed in components/drivers/include/drivers/can.h ,
which causes array index out of bound in bsp/stm32f10x/drivers/bxcan.c

temporarily remove RT_CAN_USING_BUS_HOOK, because there are some bugs in
bsp/stm32f10x/applications/canapp.c  function can_bus_hook

finsh_set_device is not needed since version 1.2.0

temporarily disable canapp initialization.

2.add change log