tf-a-static-analysis.yaml: include TF coverity check

Change-Id: I2b7ad336dff08255461c787d1a275eab9a7de02e
diff --git a/tf-a-static-analysis.yaml b/tf-a-static-analysis.yaml
index d02709f..db26796 100644
--- a/tf-a-static-analysis.yaml
+++ b/tf-a-static-analysis.yaml
@@ -81,5 +81,7 @@
             check-script: "script/static-checks/static-checks-cppcheck.sh"
         - arm-checks:
             check-script: "script/static-checks/static-checks.sh"
+        - tf-coverity:
+            check-script: "script/tf-coverity/run_coverity_on_tf.py --tf $(pwd)"
     jobs:
     - '{name}-{static}'