Revert "ci(systests/zephyr) disable input_output"

This reverts commit 697ce1c.

Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>

Author: casaroli

.github/workflows/zephyr-systests.yml

@@ -29,6 +29,7 @@ jobs:
           - lib
           - ocre
           - context
+          - input_output
     steps:
       - name: Clean other workspace
         run: rm -rf ../.west