usb: musb: Check devctl status again for a spurious session request

On start-up, we can get a spurious session request interrupt with nothing
connected. After that the devctl session bit will silently clear, but the
musb hardware is never idled until a cable is plugged in, or the glue
layer module is reloaded.

Let's just check the session bit again in 3 seconds in peripheral mode
to catch the issue.

Signed-off-by: Tony Lindgren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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