Revert "time: Run deferrable timers on other CPUs when tick_do_timer_cpu is busy"

Only Watchdog was using deferrable timers, but it is not using deferrable
any more. So reverting the change and let tick_do_timer_cpu run the
deferrable timers.

This reverts 'commit 4fe122d7 ("time: Run deferrable timers on
other CPUs when tick_do_timer_cpu is busy")'

Change-Id: I59fcd7cdb216230864cd948d242d563ade6437c8
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>