add BUILD.gn for all kernel modules
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I018446427bf64615f2596d47862b219659b58b34

1、bootargs解析与rootfs挂载进行解耦；
2、支持开发者自定义bootargs参数，内核存储bootargs中所有参数；
3、开发者可获取bootargs中的参数内容，并自行解析。

close #I41CL8

Change-Id: If384476714854ba0cf64eb70b785eb26737dd3d2
Signed-off-by: Nchenjing <chenjing139@huawei.com>

Signed-off-by: NJoker2770 <1214220480@qq.com>

1.remove redundant headfile in kernel, such as:
  compiler.h;debug.h;automount.h;inode.h;syslog.h;net.h;
2.split fs.h to file.h and driver.h
3.move vnode.h and path_cache.h to vfs/include
4.remove redundant interface and defines

close: #I3RTNR
Signed-off-by: Nmucor <mucorwang@gmail.com>