driver core: bus: mark the struct bus_type for sysfs callbacks as constant

struct bus_type should never be modified in a sysfs callback as there is
nothing in the structure to modify, and frankly, the structure is almost
never used in a sysfs callback, so mark it as constant to allow struct
bus_type to be moved to read-only memory.

Cc: "David S. Miller" <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: "K. Y. Srinivasan" <[email protected]>
Cc: Alexander Gordeev <[email protected]>
Cc: Alexandre Bounine <[email protected]>
Cc: Alison Schofield <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: Dexuan Cui <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Harald Freudenberger <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Hu Haowen <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Laurentiu Tudor <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: Stuart Yoder <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Vishal Verma <[email protected]>
Cc: Yanteng Si <[email protected]>
Acked-by: Ilya Dryomov <[email protected]> # rbd
Acked-by: Ira Weiny <[email protected]> # cxl
Reviewed-by: Alex Shi <[email protected]>
Acked-by: Iwona Winiarska <[email protected]>
Acked-by: Dan Williams <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>	# pci
Acked-by: Wei Liu <[email protected]>
Acked-by: Martin K. Petersen <[email protected]> # scsi
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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