media: rcar-csi2: Fix comment of VCDT/VCDT2 register

According to latest H/W manual v1.50, the description of channel
number in the VCDT/VCDT2 register is decremented by one.
Therefore, this patch fixes it about comment.
Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/rcar-vin/rcar-csi2.c

@@ -52,8 +52,8 @@ struct rcar_csi2;
 
 /*
  * Channel Data Type Select
- * VCDT[0-15]:  Channel 1 VCDT[16-31]:  Channel 2
- * VCDT2[0-15]: Channel 3 VCDT2[16-31]: Channel 4
+ * VCDT[0-15]:  Channel 0 VCDT[16-31]:  Channel 1
+ * VCDT2[0-15]: Channel 2 VCDT2[16-31]: Channel 3
  */
 #define VCDT_REG			0x10
 #define VCDT2_REG			0x14