Propagate PGO instr. flags to dependencies of a static lib

Bug: http://b/119560349
Bug: http://b/168925229

To build with PGO instrumentation, the link step also needs
-fprofile-generate flag.  Omitting this will result in a linker error.
This surfaces if module A depends on module B but PGO is used only for
module B.

Previous uses of PGO were avoiding or working around the issue but to
accommadate recent changes, this CL propagates the PGO linker flag to
module A.

Test: pgo-coral-config1 in release branch, TH
Change-Id: I12f6243152d4f5ea5526fbce03c25dba232ddab7