Deprecated pipe test fails for TFM non-secure board targets becuase of using deprecated functions

[nordicjm]

Describe the bug
It seems that these tests fail because of deprecated function usage warnings which are turned into errors - see https://github.com/zephyrproject-rtos/zephyr/actions/runs/12864142908/job/35862833509?pr=82907
Haven't looked into issue so assigning twister and TF-M maintainers to it

Expected behavior
Tests to pass

Impact
Showstopper holding up unrelated PRs

Environment (please complete the following information):

• Commit SHA or Version used: e658bc1

[tomi-font]

Judging from the logs, this has nothing to do with TF-M.

[Mattemagikern]

Looks like my patch is the culprit (#83283).
And it also looks like:
extra_args: CMAKE_C_FLAGS="-D__deprecated='' -D__DEPRECATED_MACRO=''"
in testcase.yaml isn't applied correctly.