In a number of cases, the .suspend, .freeze, .poweroff and .resume,
.thaw, .restore functions are identical. However, they all need to be
assigned to avoid regressionsm as the previous code called .suspend
resp. .resume in all those cases. SIMPLE_DEV_PM_OPS helps to deal
with this case.

[rjw: Changed the name of the macro and added the comment explaining its
 purpose.]
Signed-off-by: NAlbin Tonnerre <albin.tonnerre@free-electrons.com>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>