platform: nordic_nrf: Fix building psa-arch-tests for nordic boards

Fix building of psa-arch-test for nordic boards.
Missing header file for NS build: pal_plat_test.h

Change-Id: I4f9fb22f50d2bde3c2344bb92f3f1e1775b7c3ee
Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>
1 file changed