Revert^2 "exoplay min sdk bump from 19 to 21"

496036f1dd4dae471e5353289a2cc710c213deee

Change-Id: Iab521942bd954375fbd49f75bd578f03ae0b3f75
Merged-In: I6a8b8451cc79517f2ad952d57106c38384091c6e
1 file changed