driver core: class: mark the struct class for sysfs callbacks as constant

struct class 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
class to be moved to read-only memory.

While we are touching all class sysfs callbacks also mark the attribute
as constant as it can not be modified.  The bonding code still uses this
structure so it can not be removed from the function callbacks.

Cc: "David S. Miller" <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Bartosz Golaszewski <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Miquel Raynal <[email protected]>
Cc: Namjae Jeon <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: Russ Weight <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Steve French <[email protected]>
Cc: Vignesh Raghavendra <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Luis Chamberlain <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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