tests(spmd): check SMCCC NS physical FF-A instance

Check FF-A ABIs on top of SMCCCv1.2 at NS physical FF-A instance:
-For FF-A v1.0/v1.1 ABIs that do not require more than 8 registers as
input/output.
-For FF-A v1.2 ABIs using 18 registers as input/output (e.g.
FFA_PARTITION_INFO_GET_REGS).

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Ib5d29c5c5b23f6385215b76af99e5d1f72ca77ac
diff --git a/tftf/tests/aarch32_tests_to_skip.txt b/tftf/tests/aarch32_tests_to_skip.txt
index 83e4028..210d465 100644
--- a/tftf/tests/aarch32_tests_to_skip.txt
+++ b/tftf/tests/aarch32_tests_to_skip.txt
@@ -17,3 +17,4 @@
 SMMUv3 tests
 FF-A Notifications
 RMI and SPM tests
+FF-A SMCCC compliance