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/secure_fw/spm/user_partition_defines.inc b/secure_fw/spm/user_partition_defines.inc
index b2c4d8e..2680968 100644
--- a/secure_fw/spm/user_partition_defines.inc
+++ b/secure_fw/spm/user_partition_defines.inc
@@ -32,7 +32,7 @@
 /******************************* TFM_SP_AUDIT_LOG *****************************/
 PARTITION_DECLARE(TFM_SP_AUDIT_LOG,
                   SPM_PART_FLAG_SECURE | SPM_PART_FLAG_TRUSTED);
-//PARTITION_ADD_INIT_FUNC(TFM_SP_AUDIT_LOG, log_core_init);
+PARTITION_ADD_INIT_FUNC(TFM_SP_AUDIT_LOG, log_core_init);
 
 #ifdef TFM_PARTITION_TEST_SST
 /**************************** TFM_SP_SST_TEST_PARTITION ***********************/