Remove MediaCryptoTest from Security CTS

MediaCryptoTest should have been removed earlier on, but
somehow it was either added back in or forgotten to be removed.
We will proceed to remove this as part of Security CTS cleanup
and SDK level upgrade.

Bug: 27763106
Change-Id: If0e97ea9dfe9fe73eeee1f3f7536348a1c5d0bb2
6 files changed