Adding tests for Realm payload

This testing patch has the following test scenarios for realm payload:

1. Query the RMI Version on a single CPU.
2. Multi CPU version query.
3. Test to delegate and undelegate a buffer using RMI Delegate and
Undelegate commands.

Signed-off-by: Mark Dykes <mark.dykes@arm.com>
Change-Id: I3404b903b5b4f044a91ce824a408e7cf355a7589
diff --git a/tftf/tests/tests-standard.mk b/tftf/tests/tests-standard.mk
index c6c9029..a722077 100644
--- a/tftf/tests/tests-standard.mk
+++ b/tftf/tests/tests-standard.mk
@@ -23,6 +23,7 @@
 	tests-tsp.mk				\
 	tests-uncontainable.mk			\
 	tests-debugfs.mk                        \
+	tests-realm-payload.mk			\
 )
 
 include ${TESTS_MAKEFILE}