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>
5 files changed