locking, dma, ipu: Annotate bank_lock as raw

The bank_lock can be taken in atomic context (irq handling)
and therefore cannot be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: kernel@pengutronix.de
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Link: http://lkml.kernel.org/r/1311949627-13260-1-git-send-email-u.kleine-koenig@pengutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>