LoongArch: Support loader and kernel interface V40

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP



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1. LoongArch uses the new interface parameter form:
a0: efi flag, a1: command line, a2: system table
2. Boot memmap and initrd are passed to kernel via GUID.

Signed-off-by: Qiming Yang <yangqiming@loongson.cn>
Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Change-Id: I193db4238e28962bdc4ae82a232d0c343f4f32f3
(cherry picked from commit a51ad547)