Add phony target to build and dist sample code.

See http://b/issue?id=2468418
After this CL, add "samplecode" to your make goals, you will get the sample apks
built and installed at out/target/common/samples/.

Change-Id: Iff83f2ba6b6c2fe6ac1c78ca4a9d4bc6953dac8a
1 file changed