[NFC] Move MTE mode settings to a product variable. am: ea2aa5face

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/mtpd/+/23716162

Change-Id: I2941801d8b612ef4affba052f2dcbfe61d8806a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>