Static variant deps are not considered as being in the same APEX

The shared variant of a cc_library module depends on the static variant
of the same module. The dependency is just to optimize the build time by
not compiling the same source files twice. It doesn't mean that the
"static:" dependencies of the static variant are used to build the
shared variant. Therefore, the inter-variant dependency is considered
as NOT being in the same APEX.

Bug: N/A
Test: m

Change-Id: I7b8ff8e5bd5c9eb31fc4d8d18bd93dd80296fb81