Add CtsMediaProviderTranscodeTests to presubmit

Also remove MediaProviderTranscodeTests mapping since they are exactly
the same and we need only of them to run.
We'll remove the MediaProviderTranscodeTests themselves in a seaparate
cl.

BUG: 169546642
Test: presubmit
Change-Id: Ib06e4bf08c6b755927fc715f600e1dd32c497302
1 file changed