[RESTRICT AUTOMERGE][pm] Move CtsContentTestCases to postsubmit for pm changes am: e8d244301c am: cc4764ad8d

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

Change-Id: I9541bc577c5b49714c86e74db70a913cca75098e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>