[RESTRICT AUTOMERGE][pm] Move CtsContentTestCases to postsubmit for pm changes am: e8d24430

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24357433



Change-Id: I420adce1740800b4a562016085a23f742a878db7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>