AuditLog: Build system changes

Modify the cmake build files in order to build the
Audit logging service.

Change-Id: If93d849ba845f883f2cb8b35b8e8a50a2032ab9f
Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
diff --git a/CommonConfig.cmake b/CommonConfig.cmake
index b3074be..8241045 100755
--- a/CommonConfig.cmake
+++ b/CommonConfig.cmake
@@ -163,6 +163,9 @@
 set (ENABLE_SECURE_STORAGE ON)
 set (MBEDTLS_DEBUG ON)
 
+##TF-M audit logging
+config_setting_shared_flags(tfm_audit)
+
 ##Tests
 config_setting_shared_flags(tfm_secure_tests)
 config_setting_shared_flags(tfm_non_secure_tests)