Fix bug in the handling of LOCAL_HAL_STATIC_LIBRARIES

The lib indicated by LOCAL_HAL_STATIC_LIBRARIES(foo) currently gets appended
to the end of the my_static_libraries list. As a result if foo is the only one
to reference something from the static_libraries_list(bar) we die during
linking since the linker would have stripped out bar. Fix this by prepending
foo to the my_static_libraries list instead.

Change-Id: Iefffcac65dd5f05d9be2d036b42729610d2394b3