Revert "clockevents: Set noop handler in clockevents_exchange_device()"

Revert "clockevents: Set noop handler in clockevents_exchange_device()"

This reverts commit de28f25e8244c7353abed8de0c7792f5f883588c.

It results in resume problems for various people. See for example

  http://thread.gmane.org/gmane.linux.kernel/1233033
  http://thread.gmane.org/gmane.linux.kernel/1233389
  http://thread.gmane.org/gmane.linux.kernel/1233159
  http://thread.gmane.org/gmane.linux.kernel/1227868/focus=1230877

and the fedora and ubuntu bug reports

  https://bugzilla.redhat.com/show_bug.cgi?id=767248
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/904569

which got bisected down to the stable version of this commit.

Reported-by: Jonathan Nieder <[email protected]>
Reported-by: Phil Miller <[email protected]>
Reported-by: Philip Langdale <[email protected]>
Reported-by: Tim Gardner <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Greg KH <[email protected]>
Cc: [email protected]    # for stable kernels that applied the original
Signed-off-by: Linus Torvalds <[email protected]>