tick/broadcast: Sanity check the shutdown of the local clock_event

The broadcast code shuts down the local clock event unconditionally
even if no broadcast device is installed or if the broadcast device is
hrtimer based.

Add proper sanity checks.

[ Split out from a larger combo patch ]

Reported-and-tested-by: Sudeep Holla <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Suzuki Poulose <[email protected]>
Cc: Lorenzo Pieralisi <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Preeti U Murthy <[email protected]>
Cc: Ingo Molnar <[email protected]>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1507070929360.3916@nanos

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