testcase: Rename section and subsection

yashi · yashi · commit 6b0c3e32165b · 2024-06-12T15:35:46.000+09:00
Zephyr proper seems to use "libraries" as the primary section. Follow
this convention.

Signed-off-by: Yasushi SHOJI &lt;yashi@spacecubics.com&gt;
diff --git a/testcase.yaml b/testcase.yaml
@@ -1,5 +1,5 @@
 tests:
-  libcsp.subsec:
+  libraries.libcsp:
     integration_platforms:
       - qemu_cortex_m3
       - mps2/an385
