ARM: disable_nonboot_cpus before poweroffColibri_iMX6_LinuxImageV2.6Beta1_20160331Apalis_iMX6_LinuxImageV2.6Beta1_20160331

If poweroff takes a bit more time (e.g. due to I2C call), it is
quite likely that another timer interrupt fires. Timer interrupt
get broadcasted through the timer interrupt callback
tick_handle_oneshot_broadcast. This code broadcasts the timer
interrupt to all CPU's in tick_broadcast_oneshot_mask. The only
function which removes CPU from this mask is
tick_shutdown_broadcast_oneshot which ultimately get called by
_cpu_down (in kernel/cpu.c). The function disable_nonboot_cpus
makes sure that the CPU's get properly taken down and _cpu_down
gets called. With that no more broadcasts are sent to CPU's which
are no longer online.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>

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