BREAKING CHANGE:
支持proc/self目录对外变更:
1.支持/proc/self挂载目录，用于获取进程信息

Close #I6CZ72
Signed-off-by: Nzhushengle <zhushengle@huawei.com>
Change-Id: I465278785bd9e27ddbf4d34ee7b5457e39f98b5b

Change-Id: Ib07c89fe4fb840f2be4eec40a379a8f13e5ef2b6
Signed-off-by: Ngaorui <gaorui23@huawei.com>

Signed-off-by: Nzhushengle <zhushengle@huawei.com>
Change-Id: I3e4e26d55dedc1eb079911eaee59a8bddf4e8eee

1. 原kernel/common目录下属于内核拓展组件，统一移入kernel/extend管理
2. Kconfig分层，各模块自己的配置放到自己目录下管理
3. 原platform下不属于平台的公共代码抽到kernel/common下，只留板级链接脚本和一些编译脚本指向device目录下触发平台相关的编译
4. 对外公共头文件统一抽到对外include路径
5. 废弃宏，头文件清理

close: #I48KI4
Signed-off-by: Narvinzzz <zhaotianyu9@huawei.com>
Change-Id: I0cf5ea81c92a8fa7b113da9cbdc8b7bc935f5aae

close #I41P8Y
Signed-off-by: NJerryH <huangjieliang@huawei.com>
Change-Id: I01833cf617bbc695543a865dbb994c6c22d4a0a8

LiteOS_a中有部分配置宏进行了重复冗余定义，导致当头文件未被包含时，极易引入错误，
故对menuconfig配置宏进行统一处理，均使用#ifdef/#ifndef作为预编译判断方式

Close #I3YEGS

Change-Id: Ife6db770cc66de1d6199a4f3ba3950e9bfd0e71a
Signed-off-by: Nboxi <lewis.liulei@huawei.com>

close: #I3I768

Change-Id: I4f801df4abe1a9afdf43391c28276e96a5e81513

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

Change-Id: Ie1029c8fbc0c1b85c138663933118d2d148b7769

Change-Id: Ia6c1f6302407a707b3ec9b805f4c92d8a7970b86