Convert legacy-test, test-runner, and test-mock to Android.bp

See build/soong/README.md for more information.

Test: m checkbuild
Change-Id: I110f752d2fa94c44581f20d4f308d9d429da0517
Merged-In: I110f752d2fa94c44581f20d4f308d9d429da0517
(cherry-picked from commit 2b7d71c7)