Audio routing change or 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 issue is related to #1732.

[bennylp]

In 4778:

Fixed #1743: Unplugging the earpeace while audio is running would cause audio to stop in BB10 10.2.1. This also fix the issue in #1732

[bennylp]

In 4782:

More re #1743: also added code snippet to make routing selection stick even when earpleace is plugged in/out. But this doesn't seem to work (tested on Q10 OS 10.2.1)