Do not force to verify priv apps on boot

Originally, priv apps are forced to stay verified upon reboot. fs-verity
helps to postpond to verification to access time and is done by kernel.
In case if fs-verity is stripped, we fall back to classic signature
verification, which is slow as it touches the whole apk.

As we are just starting to roll out FSI, fs-verity is not served yet and
we'll be on the slow path until it's done, which will take a while. For
now, disable the force verification to priv apps.

Test: build
Bug: 154310064
Change-Id: Ibafdb79ba2e042286c9a635ec8d9159f0af6ef06