uboot-imx

efi_selftest: compile without special compiler flags

As the selftest is not compiled as an EFI binary we do not
need special compiler flags.

This avoids the checkarmreloc error on vexpress_ca15_tc2.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>