Moving default version outside of apex package

The default version needs to be used by both apex and apk updatable
modules. Moving it to android package so it can be accessed without
circular dependencies.

Test: presubmit
Bug: 231691162

Change-Id: Icafd50d0b065e89a115ae9c9b6ea55adf2730b49
Merged-In: Icafd50d0b065e89a115ae9c9b6ea55adf2730b49