arm64: cpufeature: 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: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: James Morse <[email protected]>
Cc: Kristina Martsenko <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Vladimir Murzin <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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