!265 Add LoongArch support

Merge Pull Request from: @Hongchen_Zhang 
 
This series of patches adds support for LoongArch architecture.
- Support information
  New firmware+New World system / Old firmware+New World system
  compile with new compiler
 . The Corresponding new world firmware can be download from:
https://github.com/loongson/Firmware
 . The CLFS system can be used for verification,refer to the
  following link for detail:
   https://github.com/sunhaiyong1978/CLFS-for-LoongArch/releases/tag/6.0
   https://github.com/sunhaiyong1978/CLFS-for-LoongArch/blob/main/CLFS_For_LoongArch64.md#8-%E5%88%9B%E5%BB%BA%E5%90%AF%E5%8A%A8u%E7%9B%98
- Patch from
https://github.com/loongson/linux/tree/loongarch-next ,update to 2022-09-03
- Testing
3a5000+71000, 3C5000+7A1000 boot up,reboot test OK,ltp 24 hour test OK
 
 
Link:https://gitee.com/openeuler/kernel/pulls/265

 
Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>