bonding: implement xdo_dev_state_free and call it after deletion

Add this implementation for bonding, so hardware resources can be
freed from the active slave after xfrm state is deleted. The netdev
used to invoke xdo_dev_state_free callback, is saved in the xfrm state
(xs->xso.real_dev), which is also the bond's active slave. To prevent
it from being freed, acquire netdev reference before leaving RCU
read-side critical section, and release it after callback is done.

And call it when deleting all SAs from old active real interface while
switching current active slave.

Fixes: 9a5605505d9c ("bonding: Add struct bond_ipesc to manage SA")
Signed-off-by: Jianbo Liu <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Reviewed-by: Hangbin Liu <[email protected]>
Acked-by: Jay Vosburgh <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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