Use module_current to build module stubs

module_current is always built from sources, whereas the
other SDK jars are being transitioned to be composed of
a set of stubs. This avoids the dependency cycle of module
stubs depending on themselves.

Bug: 144149403
Test: m
Change-Id: I31c6d0fa958aa502131352716a9f950828b7829c
Merged-In: I31c6d0fa958aa502131352716a9f950828b7829c
(cherry picked from commit eb34cbee)