Log: Add __assert_func and __assert_puts

As they are required by Armclang for its assert.o module

Signed-off-by: Antonio de Angelis <antonio.deangelis@arm.com>
Change-Id: I51f4585468cd3337f16e27ebda55ed64ee74f2c9
diff --git a/app_broker/CMakeLists.txt b/app_broker/CMakeLists.txt
index cfa0079..af42301 100644
--- a/app_broker/CMakeLists.txt
+++ b/app_broker/CMakeLists.txt
@@ -163,6 +163,7 @@
 
 target_sources(tfm_test_broker
     PRIVATE
+        assert.c
         main_ns.c
 )