cpu/hotplug: Clarify CPU hotplug step name for timers

After commit 249d4a9b3246 ("timers: Reinitialize per cpu bases on hotplug")
i.e. the introduction of state CPUHP_TIMERS_PREPARE instead of
CPUHP_TIMERS_DEAD the step name "timers:dead" is not longer accurate.

Rename it to "timers:prepare".

[ tglx: Massaged changelog ]

Signed-off-by: Mukesh Ojha <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Peter Zijlstra <[email protected]>
Cc: Lai Jiangshan <[email protected]>
Cc: Brendan Jackman <[email protected]>
Cc: Mathieu Malaterre <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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