drm/imx: imx-tve: use regmap fast_io spinlock
Replace the custom spinlock with the fast_io spinlock provided by
regmap.
Signed-off-by: 
Philipp Zabel <p.zabel@pengutronix.de>
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Replace the custom spinlock with the fast_io spinlock provided by
regmap.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>