[net][sal][netdev] Add IPv6 option configuration and feature support in SAL and netdev

Signed-off-by: chenyong <1521761801@qq.com>

[bsp/stm32]add stm32f2xx template

优化了 MTD_NAND 驱动框架

fix kernel and framework no cast type error 

Fix eclipse

修复cortex-a 中cache操作没有 dsb isb

[bsp][stm32] fix drv_gpio.c 直接将特殊引脚删除，不再作为 pin 设备

[libcpu][c28x] Fix bugs of old c28x interrupt api

Fix eclipse

In C28x DSP, interrupt status are stored in ST1 register. Both INTM and DBGM is used for masking interrupt, while the latter one is used in real-time debug mode. The origin function rudely enable and disable the interrupt without considering the recent interrupt status, which not only may cause  problem in some situation but also is not in conformity with rt-thread design specifications. The new api will fix this bug.

[bsp][stm32 ] 添加 SDIO_MAX_FREQ 选项

add touch index in Kconfig file

[tools] add scons --dist-ide function

[dfs] fix some bug for uffs filesystem.|修复了一些uffs文件系统的BUG.