LIB: Move NS test apps to use printf

There is no reason why the NS test apps need to use a custom logging
library and it makes it much less complicated for them to use printf
provided with the compiler.

Change-Id: Id16a84da2357b08bc6eb4fa9e30e04ad7125d2a1
Signed-off-by: Jackson Cooper-Driver <jackson.cooper-driver@arm.com>
2 files changed