libcamera: v4l2_device: Rename plane format fields

Rename the number of valid plane formats to 'planesCount' and the actual
per-plane size information array to 'planes'.

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/include/v4l2_device.h

@@ -63,8 +63,8 @@ public:
 	struct {
 		uint32_t size;
 		uint32_t bpl;
-	} planesFmt[3];
-	unsigned int planes;
+	} planes[3];
+	unsigned int planesCount;
 };
 
 class MediaEntity;