Build: Add the tfm NS log library

This part is missed for the new build system.
The NS log implementations have been seperated from the TF-M.
The NS is using the one in TF-M.

This patch adds the NS log library.
Corresponding changes are required in TF-M repo to
1. Add the NS log library to build
2. Remove the build for the log implementation in NS interface

Change-Id: Ic71b244fb93651974422b49a24d08e5a270dd5f5
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
diff --git a/app/tfm_log.h b/app/tfm_log.h
index 5b8a06f..5563434 100644
--- a/app/tfm_log.h
+++ b/app/tfm_log.h
@@ -8,7 +8,7 @@
 #ifndef __TFM_LOG_H__
 #define __TFM_LOG_H__
 
-#include "log/tfm_log_raw.h"
+#include "tfm_log_raw.h"
 
 /* Functions and macros in this file is for 'thread mode' usage. */