Move prebuilts mutators after defaults have been applied

A follow up change will add a mechanism for a module to register a hook
that is called after any defaults have been applied. That is intended
for use by modules like java_sdk_library that create child modules that
are dependent upon properties that could be supplied by defaults.

Creating those child modules after prebuilts mutators are run will
cause problems if those child modules clash with prebuilts modules.
Moving the prebuilts mutators after the defaults mutators will fix
that.

Tests are currently being run with the mutators in different orders so
this change also cleans that up so they are consistent with the actual
code that is being run.

Bug: 155295806
Test: m checkbuild
Change-Id: I825c6df09058fb3a45db196661959eb332aca2f3