arm: Use common outgoing-CPU-notification code

This commit removes the open-coded CPU-offline notification with new
common code.  In particular, this change avoids calling scheduler code
using RCU from an offline CPU that RCU is ignoring.  This is a minimal
change.  A more intrusive change might invoke the cpu_check_up_prepare()
and cpu_set_state_online() functions at CPU-online time, which would
allow onlining throw an error if the CPU did not go offline properly.

Signed-off-by: Paul E. McKenney <[email protected]>
Cc: [email protected]
Cc: Russell King <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Dietmar Eggemann <[email protected]>

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