Simplify package by using LoadHook instead of mutators

This was not previously possible due to LoadHooks being run after the
module was registered.

Bug: 155462403
Test: m nothing
Merged-In: Ia8383b9d1272bb12c8a83948753a0e4b0d98a650
Change-Id: Ia8383b9d1272bb12c8a83948753a0e4b0d98a650
(cherry picked from commit cdfcec98)