close: #I4ATUC
Signed-off-by: NLeon Chan <chenwei26@huawei.com>

增加mount的MS_RDONLY标志的支持，并修改vfs主要接口相关支持

Close #I3Z1W6
Signed-off-by: NFar <yesiyuan2@huawei.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>

Change-Id: I05564abac3f0a8f7881ebe8b5b72c1b6abbbe448

Change-Id: I256c6d908bce019698d349456109c8437ba751fc

Description:Delete VM to support only kernel mode.
Sig:liteos_a
Feature or Bugfix:Feature
Binary Source:No

Change-Id: Ie1029c8fbc0c1b85c138663933118d2d148b7769

Feature or Bugfix:Feature
Binary Source:Huawei
PrivateCode(Yes/No):Yes

Change-Id: I175d2648bc6f9078c34de2c0a5c93fda10b86c47
ChangeID:13306420