stagefright: Use 64 bits for type mask in MediaCodecList

 * We're supporting a lot of media types now, and the codec lookup
   uses a 32-bit mask which limits us. Change this to 64 bits.

Change-Id: Ic60e313a1dd133b0ac33b80a201d462e55d50096
Merge "stagefright: Use 64 bits for type mask in MediaCodecList" into du44