media: Kconfig files: use the right help coding style

Checkpatch wants to use 'help' instead of '---help---':

	WARNING: prefer 'help' over '---help---' for new help texts

Let's change it globally at the media subsystem, as otherwise people
would keep using the old way.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/pci/intel/ipu3/Kconfig

@@ -7,7 +7,7 @@ config VIDEO_IPU3_CIO2
 	select V4L2_FWNODE
 	select VIDEOBUF2_DMA_SG
 
-	---help---
+	help
 	  This is the Intel IPU3 CIO2 CSI-2 receiver unit, found in Intel
 	  Skylake and Kaby Lake SoCs and used for capturing images and
 	  video from a camera sensor.