Revert "Update TEST_MAPPING to include CtsMediaMiscTestCases"

Revert "CtsMedia: Rename CtsMediaTestCases as CtsMediaMiscTestCases"

Revert submission 1978570-cts-media-misc-reorg

Reason for revert:merge conflict in stage-aosp-master
Bug: 215230968
Bug: 220197952
Reverted Changes:
I4e6f88920:Update TEST_MAPPING to include CtsMediaMiscTestCas...
Id57f3d675:CtsMedia: Rename CtsMediaTestCases as CtsMediaMisc...

Change-Id: I6301ec32373a201174ac5b65cca428fa652a99c4