FROMLIST: PM / sleep: print function name of callbacks

FROMLIST: PM / sleep: print function name of callbacks

The printouts writen to the logs by suspend can be a bit opaque: it can
be hard to track them down to the actual function called.  You might
see:

  calling  rfkill1+ @ 19473, parent: phy0
  call rfkill1+ returned 0 after 1 usecs
  calling  phy0+ @ 19473, parent: mmc2:0001:1
  call phy0+ returned 0 after 19 usecs

It's a bit hard to know what's actually happening.  Instead, it's nice
to see:

  calling  rfkill1+ @ 15793, parent: phy0, cb: rfkill_suspend
  call rfkill1+ returned 0 after 1 usecs
  calling  phy0+ @ 15793, parent: mmc2:0001:1, cb: wiphy_suspend [cfg80211]
  call phy0+ returned 0 after 7 usecs

That makes it very obvious what's going on.  It also has the nice side
effect of making the suspend/resume spew a little more obvious, since
many resume functions have the word "resume" in the name:

  calling  phy0+ @ 15793, parent: mmc2:0001:1, cb: wiphy_resume [cfg80211]
  call phy0+ returned 0 after 12 usecs
  calling  rfkill1+ @ 15793, parent: phy0, cb: rfkill_resume
  call rfkill1+ returned 0 after 1 usecs

Change-Id: I32dcedfa013393aab79af852304c7d9f3465f183
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>