fix AudioTrack and AudioRecord JNI

AudioTrack and AudioRecord JNI should not cast
jshortArray to jbyteArray. This appeared to work with Dalvik
but causes data corruption with ART.

(cherry picked from commit 9d02848e902d04417df616354db3a18c03e639b7)

Change-Id: Ie36624d3ea06042373c64edced4b5e30b7b1ee86