test: provide tests for efi_image_region_add()

Provide unit tests for efi_image_region_add().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/test/lib/Makefile b/test/lib/Makefile
index ce9ae4a..6ccc2c4 100644
--- a/test/lib/Makefile
+++ b/test/lib/Makefile
@@ -3,6 +3,7 @@
 # (C) Copyright 2018
 # Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
 obj-y += cmd_ut_lib.o
+obj-$(CONFIG_EFI_SECURE_BOOT) += efi_image_region.o
 obj-y += hexdump.o
 obj-y += lmb.o
 obj-y += string.o