Temporarily add support for conditional modules

Some bootclasspath libraries are currently conditionally included
in the SDK. Add support for that in api.go.

Bug: 169103987
Test: mmm frameworks/base/api
Merged-In: I7704a884675eb58c429a59f99a663cf09807ecec
Change-Id: I7704a884675eb58c429a59f99a663cf09807ecec
1 file changed