LoongArch: Add a missing call to efi_esrt_init()

ESRT (EFI System Resource Table) is needed for UEFI's "Capsule Update"
feature. But ESRT initialization is missing on LoongArch now, so add a
call to efi_esrt_init() at the end of efi_init().
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/kernel/efi.c

@@ -140,4 +140,6 @@ void __init efi_init(void)
 
 		early_memunmap(tbl, sizeof(*tbl));
 	}
+
+	efi_esrt_init();
 }