efi_loader: consistent build flags for EFI applications

At the same time adding and removing the -Os flag does not make any sense.
Actually it leads to -Os not being used.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 5b80469..b3d3dad 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -6,9 +6,9 @@
 # object inclusion implicitly depends on it
 
 CFLAGS_efi_selftest_miniapp_exit.o := $(CFLAGS_EFI) -Os -ffreestanding
-CFLAGS_REMOVE_efi_selftest_miniapp_exit.o := $(CFLAGS_NON_EFI) -Os
+CFLAGS_REMOVE_efi_selftest_miniapp_exit.o := $(CFLAGS_NON_EFI)
 CFLAGS_efi_selftest_miniapp_return.o := $(CFLAGS_EFI) -Os -ffreestanding
-CFLAGS_REMOVE_efi_selftest_miniapp_return.o := $(CFLAGS_NON_EFI) -Os
+CFLAGS_REMOVE_efi_selftest_miniapp_return.o := $(CFLAGS_NON_EFI)
 
 obj-y += \
 efi_selftest.o \