utils: ipu3-capture.sh: Fix the script to work with recent media-ctl versions

Recent media-ctl versions include the framerate in the fmt property output:

- entity 37: ov5693 4-0036 (1 pad, 1 link)
             type V4L2 subdev subtype Sensor flags 0
             device node name /dev/v4l-subdev6
	pad0: Source
		[fmt:SBGGR10_1X10/2592x1944@1/30
		 crop.bounds:(16,6)/2592x1944
		 crop:(16,6)/2592x1944]
		-> "ipu3-csi2 1":0 [ENABLED]

This resulted in $sensor_size getting set to: "2592x1944@1 30", which
causes the script to fail.

Fix this by:

1. Replacing the gsub() to remove the '/' between e.g. SBGGR10_1X10
and 2592x1944 with a sub() so that only that first '/' gets replaced
(resulting in a $sensor_size of "2592x1944@1/30" instead).

2. Adding a new sub() to remove the @1/30 suffix.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

utils/ipu3/ipu3-capture.sh

@@ -63,7 +63,8 @@ parse_pipeline() {
 		if (sensor) {
 			gsub(\".*fmt:\", \"\");
 			gsub(\"[] ].*\", \"\");
-			gsub(\"/\", \" \");
+			sub(\"/\", \" \");
+			sub(\"@[0-9]+/[0-9]+\", \"\");
 			format=\$0;
 		}
 	}