Remove PSA generation test as PSA is no longer upsater nor required for 5.15 releases.

Author: saheerb

.travis.yml

@@ -189,24 +189,6 @@ matrix:
 
 
     ### Extended Tests ###
-    - &extended-vm
-      stage: "Extended"
-      name: "psa autogen"
-      env: NAME=psa-autogen
-      language: python
-      python: 3.7
-      install:
-        # Install gcc
-        - source_pkg gcc
-        - arm-none-eabi-gcc --version
-        # Install python modules
-        - python -m pip install --upgrade pip==18.1
-        - python -m pip install --upgrade setuptools==40.4.3
-        - pip install -r requirements.txt
-        - pip list --verbose
-      script:
-        - python tools/psa/generate_partition_code.py
-        - git diff --exit-code
 
     - <<: *extended-vm
       name: "events"