time: Fixup fallout from recent clockevent/tick changes

Make the stub function static inline instead of static and move the
clockevents related function into the proper ifdeffed section.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Soren Brinkmann <soren.brinkmann@xilinx.com>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>