fix(corstone1000): skip some TF-A tests

Some of the TF-A tests get stuck when run on TF-A master for Corstone-1000.
So, skip those tests for now for Corstone-1000. This change is required to integrate Corstone-1000 FVP platform in TF-A Open CI

Change-Id: I3fd06200141e18b9c6c767718aaf52aede136560
Signed-off-by: Harsimran Singh Tungal <harsimransingh.tungal@arm.com>
diff --git a/plat/arm/corstone1000/tests_to_skip.txt b/plat/arm/corstone1000/tests_to_skip.txt
index a928249..d937e42 100644
--- a/plat/arm/corstone1000/tests_to_skip.txt
+++ b/plat/arm/corstone1000/tests_to_skip.txt
@@ -14,3 +14,5 @@
 PSCI CPU Suspend
 PSCI CPU Suspend in OSI mode
 PSCI STAT/for valid composite state CPU suspend
+FF-A Setup and Discovery/FF-A RXTX remap unmapped region success
+FF-A Memory Sharing/Normal World VM retrieve request into SPMC