libcamera: v4l2_videodevice: Create color-format planes in createBuffer()

V4L2VideDevice::createBuffer() creates the same number of
FrameBuffer::Planes as V4L2 format planes. Therefore, if the v4l2 format
single is single-planar format, the created number of
FrameBuffer::Planes is 1. It should rather create the same number of
FrameBuffer::Planes as the color format planes.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/internal/v4l2_videodevice.h

@@ -242,6 +242,7 @@ private:
 	FrameBuffer *dequeueBuffer();
 
 	V4L2Capability caps_;
+	V4L2DeviceFormat format_;
 
 	enum v4l2_buf_type bufferType_;
 	enum v4l2_memory memoryType_;