goldfish: declare clearkey drm service

BUG: 77914458
Test:
run cts -m CtsMediaTestCases -t android.media.cts.MediaDrmClearkeyTest#testHdcpLevels

this does not impact real devices

Change-Id: Ibf71bd836f3811daa265822eeb57c651aab1914b
1 file changed