i2c: imx: Clean up a call to request_irq()

This is passing a NULL thread to request_threaded_irq().  So it's not
really a threaded IRQ at all.  It's more readable to call request_irq()
instead.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/fa375cc0-893a-4e64-8bf6-cc37f9ebecf5@moroto.mountain


Signed-off-by: Andi Shyti <andi.shyti@kernel.org>