Unplugging the earpeace while audio is running would cause audio to stop in BB10 10.2.1

[bennylp]

When the user unplugged the earpeace during a SIP call the audio will get into error state:

"Level:  -02-27 10:13:07.051     bb10_dev.c !PLAY thread ERROR status = 10001" 
"Level:  -02-27 10:13:07.052     bb10_dev.c  PLAY thread ERROR status = 10001" 
"Level:  -02-27 10:13:07.054     bb10_dev.c !snd_pcm_plugin_read ERROR read = -5 required = 640" 
"Level:  -02-27 10:13:07.054     bb10_dev.c  snd_pcm_plugin_read ERROR read = -5 required = 640
"Level:  -02-27 10:13:07.055     bb10_dev.c  snd_pcm_plugin_read ERROR read = -5 required = 640" 
"Level:  -02-27 10:13:07.056     bb10_dev.c  snd_pcm_plugin_read ERROR read = -5 required = 640" 
"Level:  -02-27 10:13:07.057     bb10_dev.c  snd_pcm_plugin_read ERROR read = -5 required = 640" 

Process 27738341 received low memory signal, priority = 1 
Process 27738341 received low memory signal, priority = 1 
Process 27738341 received low memory signal, priority = 2 
Process 27738341 received low memory signal, priority = 2

This seems to be the same BB10 OS bug as previously reported in #1732. We found and subsequently fixed in #1732 that the BB10 audio device (specific to 10.2.1) would get into error state (the "-5" error) if audio routing is switched while playback/recording is in progress.