[media] v4l: vsp1: Fix spinlock in mixed IRQ context function

The wpf_configure() function can be called both from IRQ and non-IRQ
contexts, use spin_lock_irqsave().

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>