[DeviceDrivers] add pwm driver framework.

[tools][scons] Fix error notice when 'EXEC_PATH' is not exist.

[WIP] [tools][scons] Add error notice when 'EXEC_PATH' is not exist.

[components][finsh]msh最大参数个数可配置

[components][drivers]Kconfig更新

[components][drivers]wlan驱动框架更新

Fix the SD Card and EMAC issue:

[bsp][hifive1] remove unused code

1. The issue concerns sdmmc library bug (I finally solved) in SD_Init() in the file sdmmc/src/fsl_sd.c:SD_SelectBusTiming()
calls SD_SwitchFunction() which sets block size to 64bytes (512bits).Therefore SD_SetBlockSize(card, FSL_SDMMC_DEFAULT_BLOCK_SIZE)
should be called again before SD_Init() exits.
2. The issue is wrong variable in drv_emac.c:lpc_emac_tx(), and the wrong data length of send packet
to cause the send failure.
Signed-off-by: Nzheng-chow <sernia.zhou@foxmail.com>

 [libcpu][arm][arm926] Using C header file to define stack and heap size.

to be able debug trace bit  before use DWT.

[bsp] [stm32f10x]  fix watchdog control set timeout argument bug.

Fix apollo429

[components][lwIP] Change the lwIP default selected version to 2.0.2.

[bsp][stm32f429-apollo] Disable the SPI DMA mode. It has some problem when using big data transmission.