Build: Update app_broker build

Update app_broker build to make dependencies more stable.

  - Sort NS library folder structure.
    Move common library folders out of app_broker. Place them under lib
    folder. Move CMSIS to lib/ext.
    It is expected that users can re-use those library in other NS
    integration with TF-M.
  - NS libraries depend on each other and therefore the dependencies are
    complicated. Build those NS libraries under app_broker to more
    easily sort out dependencies. Remove build files from library
    folders.

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: I8c2ff7bbec6c03738b9cbe49fd286a5147293ba5
diff --git a/app_broker/test_app.h b/app_broker/test_app.h
index d60827c..35728ba 100644
--- a/app_broker/test_app.h
+++ b/app_broker/test_app.h
@@ -8,6 +8,8 @@
 #ifndef __TFM_TEST_APP_H__
 #define __TFM_TEST_APP_H__
 
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif