spi: rockchip: Use plain request_irq()

spi: rockchip: Use plain request_irq()

The Rockchip driver has since interrupt support was added used
request_threaded_irq() but not actually supplied a threaded handler,
handling everything in the primary handler.  This is equivalent to just
using a plain request_irq(), and since aef30c8d569c (genirq: Warn about
using IRQF_ONESHOT without a threaded handler) the current behaviour has
triggered a WARN_ON().  Convert to use request_irq().

Reported-by: Aishwarya TCV <Aishwarya.TCV@arm.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20260116-spi-rockchip-threaded-irq-v1-1-c45c3a5a38b1@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>