pixel/all: Print parallel output, prefix with device name

* It's a bit spammy but better to see it do something
  then have to just sit by.
* Can always pipe it somewhere and grep for device to get
  logs for just that

Change-Id: I855d067794016515e4bc2453b30edd6afc0b3b4f
1 file changed
tree: 212b9b248708050cd15e70124d3e4f3177b17225
  1. pixel/