omx: restrict useBuffer according to buffer type and port mode

Bug: 77486542
Test: sts-tradefed run sts -m StsHostTestCases -t android.security.sts.Poc18_06#testPocBug_77486542
Test: adb shell am instrument -e size small -w 'android.media.cts/android.support.test.runner.AndroidJUnitRunner'
Test: Exercise secure playback with Play Movies app.
Test: Record video with Camera app and play it back with Photos app

Change-Id: Ief2d2d4d0445074c0ecdc723b1b25997a7631389