[BUG] soc/sti: a possible sleep-in-atomic bug in uni_player_ctl_iec958_put

[Jia-Ju Bai]

According to sound/soc/sti/uniperif_player.c, the driver may sleep under 
a spinlock.
The function call path is:
uni_player_ctl_iec958_put (acquire the spinlock)
  uni_player_set_channel_status
    mutex_lock --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and checked 
by my code review.


Thanks,
Jia-Ju Bai