mainline inclusion
from mainline-v5.19-rc1
commit fa96b57c
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5OHOB
CVE: NA

--------------------------------

Add Kbuild, Makefile, Kconfig and link script for LoongArch build
infrastructure.
Reviewed-by: NGuo Ren <guoren@kernel.org>
Reviewed-by: NWANG Xuerui <git@xen0n.name>
Reviewed-by: NJiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>