test: Apply semantic patch file ztest_strcmp.cocci

This patch file updates the use of assertion macros
comparing strings.

Command line used:
```
./scripts/coccicheck --mode=patch \
--cocci=scripts/coccinelle/ztest_strcmp.cocci tests/
```

Signed-off-by: Rubin Gerritsen <rubin.gerritsen@nordicsemi.no>
33 files changed