MediaController: workaround to disable seek
MediaController: workaround to disable seek

An example use case is live HLS streams.

Bug:19489473
Change-Id: I9c278f2875a5faaf1af092cc84888d4280a00747

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base