media: imx: imx7_mipi_csis: Drop csi_state phy field

The phy field of the csi_state structure is unused. Drop it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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

@@ -304,7 +304,6 @@ struct csi_state {
 
 	u8 index;
 	struct platform_device *pdev;
-	struct phy *phy;
 	void __iomem *regs;
 	int irq;
 	u32 flags;