media: v4l2-mediabus: Drop legacy V4L2_MBUS_CSI2_CHANNEL_* flags

The V4L2_MBUS_CSI2_CHANNEL_* flags are a legacy API. Only
V4L2_MBUS_CSI2_CHANNEL_0 is used, set in a single driver, and never
read. Drop those flags. Virtual channel information should be conveyed
through frame descriptors instead.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/adv7180.c

@@ -786,7 +786,6 @@ static int adv7180_get_mbus_config(struct v4l2_subdev *sd,
 		cfg->type = V4L2_MBUS_CSI2_DPHY;
 		cfg->bus.mipi_csi2.num_data_lanes = 1;
 		cfg->bus.mipi_csi2.flags =
-				V4L2_MBUS_CSI2_CHANNEL_0 |
 				V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
 	} else {
 		/*

include/media/v4l2-mediabus.h

@@ -67,20 +67,10 @@
 #define V4L2_MBUS_DATA_ENABLE_LOW		BIT(15)
 
 /* Serial flags */
-/* CSI-2 Virtual Channel identifiers. */
-#define V4L2_MBUS_CSI2_CHANNEL_0		BIT(4)
-#define V4L2_MBUS_CSI2_CHANNEL_1		BIT(5)
-#define V4L2_MBUS_CSI2_CHANNEL_2		BIT(6)
-#define V4L2_MBUS_CSI2_CHANNEL_3		BIT(7)
 /* Clock non-continuous mode support. */
 #define V4L2_MBUS_CSI2_CONTINUOUS_CLOCK		BIT(8)
 #define V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK	BIT(9)
 
-#define V4L2_MBUS_CSI2_CHANNELS		(V4L2_MBUS_CSI2_CHANNEL_0 | \
-					 V4L2_MBUS_CSI2_CHANNEL_1 | \
-					 V4L2_MBUS_CSI2_CHANNEL_2 | \
-					 V4L2_MBUS_CSI2_CHANNEL_3)
-
 #define V4L2_MBUS_CSI2_MAX_DATA_LANES		8
 
 /**