net: sfp: add mutex to prevent concurrent state checks

sfp_check_state can potentially be called by both a threaded IRQ handler
and delayed work. If it is concurrently called, it could result in
incorrect state management. Add a st_mutex to protect the state - this
lock gets taken outside of code that checks and handle state changes, and
the existing sm_mutex nests inside of it.

Suggested-by: Russell King <[email protected]>
Signed-off-by: Robert Hancock <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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