libcamera: v4l2_videodevice: Pass memory type to reqbufs()

To prepare for the rework of buffer export, pass the memory type
explicitly to the V4L2VideoDevice::reqbufs() function.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/include/v4l2_videodevice.h

@@ -226,7 +226,7 @@ private:
 
 	int setSelection(unsigned int target, Rectangle *rect);
 
-	int requestBuffers(unsigned int count);
+	int requestBuffers(unsigned int count, enum v4l2_memory memoryType);
 	std::unique_ptr<FrameBuffer> createBuffer(const struct v4l2_buffer &buf);
 	FileDescriptor exportDmabufFd(unsigned int index, unsigned int plane);