cpu/hotplug: move to use bus_get_dev_root()

Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

Cc: Thomas Gleixner <[email protected]>
Cc: Valentin Schneider <[email protected]>
Cc: Phil Auld <[email protected]>
Cc: Steven Price <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Vincent Donnefort <[email protected]>
Cc: Kuppuswamy Sathyanarayanan <[email protected]>
Cc: "Jason A. Donenfeld" <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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