Changes

firmware: fix msgb/list mixed irq access handling

This fixes the mishandling of in_progress and the queues in the submit
functions that are in part irq driven, too, and ensures nothing breaks
by preventing concurrent access from irqs to the queues. Applying the
same pattern to all functions/cases is fine either way.

On top of all of tha the out ep was irq driven, so if submit_next_out
fails it was stuck, now fixed by attempted submit from main loop, and of
course the queue manipulation should be irq safe here as well.

Change-Id: I9212bfa7688cb4d3161ba963b854225744128632