libvirtual should depend on libmedia

This library's source code includes libmedia headers.

Bug: 27804373
Change-Id: I5379455d6a10022e1e0b4fcf4efce11022c0301e
Test: Compiles
Our virtual.cpp also includes libmedia headers, and no reason for
separate static libbase dependency, and ensuing code duplication.
1 file changed