Merge pull request #854 from orenc17/patch-1

Update ci with PSA SPM travis job

Author: Amanda Butler

docs/reference/contributing/guidelines/ci.md

@@ -21,6 +21,9 @@ Travis configuration is located in the [.travis.yml](https://github.com/ARMmbed/
 - **travis-ci/licence_check** - Check there is no GPL licence text in the code.
 - **travis-ci/littlefs** - Test littlefs without embedded hardware.
 - **travis-ci/tools-py2.7** - Run Python tools tests with Python 2.7.
+- **travis-ci/psa-autogen** - Runs PSA SPM code generator.
+   - Asserts that all PSA manifests in the tree are in correct form.
+   - Asserts that no changes need to be made.
 
 ### Jenkins