media: docs: split vimc.rst into devel and admin parts

The vimc driver has some kerneldoc markups, plus admin info.
Split it into two files.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/media/v4l-drivers/index.rst

@@ -67,4 +67,6 @@ For more details see the file COPYING in the source distribution of Linux.
 	zr364xx
 
 	cpia2_devel
+	vimc-devel
+
 	meye-uapi

Documentation/media/v4l-drivers/vimc-devel.rst

+.. SPDX-License-Identifier: GPL-2.0
+
+The Virtual Media Controller Driver (vimc)
+==========================================
+
+Source code documentation
+-------------------------
+
+vimc-streamer
+~~~~~~~~~~~~~
+
+.. kernel-doc:: drivers/media/platform/vimc/vimc-streamer.h
+   :internal:
+
+.. kernel-doc:: drivers/media/platform/vimc/vimc-streamer.c

Documentation/media/v4l-drivers/vimc.rst

@@ -88,14 +88,3 @@ Vimc has a module parameter to configure the driver.
         height, so the image size will be ``sca_mult^2`` bigger than the
         original one. Currently, only supports scaling up (the default value
         is 3).
-
-Source code documentation
--------------------------
-
-vimc-streamer
-~~~~~~~~~~~~~
-
-.. kernel-doc:: drivers/media/platform/vimc/vimc-streamer.h
-   :internal:
-
-.. kernel-doc:: drivers/media/platform/vimc/vimc-streamer.c