tty: serial: constify sunhv_ops structs
Constifies sunhv_ops structures in tty's serial driver since they are not modified after their initialization. Detected and found using Coccinelle. Suggested-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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