IMA: Fix broken build

glob pattern ima_* in SUBDIRS is broken for out-of-tree build.

Fixes: b80a39381 ("IMA: Refactor datafiles directory")

Signed-off-by: Petr Vorel <pvorel@suse.cz>
diff --git a/testcases/kernel/security/integrity/ima/datafiles/Makefile b/testcases/kernel/security/integrity/ima/datafiles/Makefile
index 6857ccf..47a4704 100644
--- a/testcases/kernel/security/integrity/ima/datafiles/Makefile
+++ b/testcases/kernel/security/integrity/ima/datafiles/Makefile
@@ -26,6 +26,6 @@
 
 include	$(top_srcdir)/include/mk/env_pre.mk
 
-SUBDIRS	:= ima_*
+SUBDIRS	:= ima_kexec ima_keys ima_policy
 
 include $(top_srcdir)/include/mk/generic_trunk_target.mk