loongarch: efi: enable generic EFI compressed boot

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5OHOB

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

Wire up the generic EFI zboot support for LoongArch64
Signed-off-by: NArd Biesheuvel <ardb@kernel.org>
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>

arch/loongarch/Makefile

@@ -94,7 +94,7 @@ vdso_install:
 
 all:	$(notdir $(KBUILD_IMAGE))
 
-vmlinux.elf vmlinux.efi: vmlinux
+vmlinux.elf vmlinux.efi vmlinuz.efi: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $(bootvars-y) $(boot)/$@
 
 install:

arch/loongarch/boot/Makefile

@@ -18,3 +18,9 @@ $(obj)/vmlinux.elf: vmlinux FORCE
 targets += vmlinux.efi
 $(obj)/vmlinux.efi: vmlinux FORCE
 	$(call if_changed,objcopy)
+
+EFI_ZBOOT_PAYLOAD      := vmlinux.efi
+EFI_ZBOOT_BFD_TARGET   := elf64-loongarch
+EFI_ZBOOT_MACH_TYPE    := LOONGARCH64
+
+include $(srctree)/drivers/firmware/efi/libstub/Makefile.zboot