Build: Update file name of TZ NS API

In TF-M, file tfm_psa_ns_api.c is renamed to tfm_tz_psa_ns_api.c.
Related change is also required in tf-m-extras.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I551405d9cd1e1604037dda3ccbc3098f05ddb76c
2 files changed