libstagefright: LPA playback fails when non-LPA clip is next clip

-When non-LPA clip follows an LPA clip in Music App,
 playback of LPA clip fails.
-setNextPlayer causes the loading of decoder omx component
 and acquires the DSP resources for non-LPA clip, even before
 LPA clip acquires DSP resources.
-Add property to check if hardware decoder needs to be overridden.
 If LPA is in progress, the select software decoder for next
 clip.

Change-Id: I0e40fa9859faf84f241e721cdbcb88302c698b8b