efi_selftest: test variable services at runtime

Provide a unit test for the variable services at runtime.

Currently we expect EFI_UNSUPPORTED to be returned as the runtime
implementation is still missing.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 3bebd0f..8867875 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -35,6 +35,7 @@
 efi_selftest_tpl.o \
 efi_selftest_util.o \
 efi_selftest_variables.o \
+efi_selftest_variables_runtime.o \
 efi_selftest_watchdog.o
 
 obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_selftest_devicepath.o