[Kernel] Add HWREG macro.

[bsp][dm365] Fix compile error.

1. Add macro check in rtdebug.h;
2. Use RT_USING_POSIX for poll/select, stdin etc.
3. Split dfs_posix.h to dfs_posix.h, dfs_poll.h and dfs_select.h;

[bsp] Fix compile error.

[bsp][lm3s8962] Fix complie error. Add missing macro RT_USING_LIBC. Force use Lwip 1.4.1 bye define RT_USING_LWIP141

[DFS][NFS] Fix compile error. Move nfs_file/nfs_dir data ptr into struct nfs_filesystem

[BSP] fix the compiling issue.

[components][net] In SConscript file, replace RT_USING_LWIP140 with RT_USING_LWIP141

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

1. Remove RT_LWIP_USING_RT_MEM option;
2. Add waitqueue patch for lwIP 2.0.2;