genirq: Move bus locking into __setup_irq()

There is no point in having the irq_bus_lock() protection around all
callers to __setup_irq().

Move it into __setup_irq(). This is also a preparatory patch for addressing
the issues with the irq resource callbacks.

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Marc Zyngier <[email protected]>
Cc: Heiko Stuebner <[email protected]>
Cc: Julia Cartwright <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Brian Norris <[email protected]>
Cc: Doug Anderson <[email protected]>
Cc: [email protected]
Cc: John Keeping <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]

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