Try to leak counter values from secure world.

This patch introduces a series of tests that try to leak PMU counter values
from EL3 and S_EL1.

PMU events used:
	- CPU cycles via PMU counter PMCCNTR_EL0
	- Retired writes to PC via PMU counter PMEVCNTR0_EL0

This AARCH64-specific patch is for security fix:
https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/1789

The AARCH32 versions of these tests will be in a future patch.

Signed-off-by: Petre-Ionut Tudor <petre-ionut.tudor@arm.com>
Change-Id: Ib27948edadde30272e59a9ab208543703fa078bd
diff --git a/tftf/tests/tests-extensive.xml b/tftf/tests/tests-extensive.xml
index 67d2346..773c19e 100644
--- a/tftf/tests/tests-extensive.xml
+++ b/tftf/tests/tests-extensive.xml
@@ -22,6 +22,7 @@
   <!ENTITY tests-cpu-extensions SYSTEM "tests-cpu-extensions.xml">
   <!ENTITY tests-performance SYSTEM "tests-performance.xml">
   <!ENTITY tests-smc SYSTEM "tests-smc.xml">
+  <!ENTITY tests-pmu-leakage SYSTEM "tests-pmu-leakage.xml">
 ]>
 
 <testsuites>
@@ -39,5 +40,6 @@
   &tests-cpu-extensions;
   &tests-performance;
   &tests-smc;
+  &tests-pmu-leakage;
 
 </testsuites>