Prevent the .got from being required by EFI.

memcpy is leaking into the initrddump EFI file, which
causes failures.

This change is based on the u-boot change "efi_loader
helloworld.efi: Fix building with -Os"
(3bb74f9800cdc4cf10a87f2725242c2565256654), which has
since been largely reverted.

--- u-boot-2022.04/lib/efi_loader/Makefile.orig
+++ u-boot-2022.04/lib/efi_loader/Makefile
@@ -17,7 +17,7 @@ CFLAGS_REMOVE_helloworld.o := $(CFLAGS_N
 CFLAGS_dtbdump.o := $(CFLAGS_EFI) -Os -ffreestanding
 CFLAGS_REMOVE_dtbdump.o := $(CFLAGS_NON_EFI)
 CFLAGS_initrddump.o := $(CFLAGS_EFI) -Os -ffreestanding
-CFLAGS_REMOVE_initrddump.o := $(CFLAGS_NON_EFI)
+CFLAGS_REMOVE_initrddump.o := $(CFLAGS_NON_EFI) -Os
 
 ifneq ($(CONFIG_CMD_BOOTEFI_HELLO_COMPILE),)
 always += helloworld.efi