media: imx: imx7_mipi_csis: Acquire reset control without naming it

The device has a single reset line, there's thus no need to name it
explicitly when calling devm_reset_control_get_exclusive(). Drop the
name in preparation for the removal of the reset-names property in the
DT binding.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/imx/imx7-mipi-csis.c

@@ -943,7 +943,7 @@ static int mipi_csis_parse_dt(struct platform_device *pdev,
 		state->clk_frequency = DEFAULT_SCLK_CSIS_FREQ;
 
 	/* Get MIPI PHY resets */
-	state->mrst = devm_reset_control_get_exclusive(&pdev->dev, "mrst");
+	state->mrst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
 	if (IS_ERR(state->mrst))
 		return PTR_ERR(state->mrst);