zephyr: Include samples and tests in the module definition

We have both sample and test apps. Be sure to include the directories for
these into the module definition so that they can be leveraged by twister
and compliance checking.

Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>

Author: jhedberg

zephyr/module.yml

@@ -21,3 +21,7 @@ build:
     # Zephyr will use the `<soc_root>/soc` for additional socs. The `.` is the
     # root of this repository.
     soc_root: .
+samples:
+  - samples
+tests:
+  - tests