powerpc/powernv: 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: Michael Ellerman <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Joel Stanley <[email protected]>
Cc: Liang He <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Julia Lawall <[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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