[media] move s5p-cec to staging

As the CEC core is currently at staging, it doesn't make any sense
to put a dependent driver outside staging. So, move it also to
staging.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 7f76a3b..962c5b0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1647,7 +1647,7 @@
 L:	linux-arm-kernel@lists.infradead.org
 L:	linux-media@vger.kernel.org
 S:	Maintained
-F:	drivers/media/platform/s5p-cec/
+F:	drivers/staging/media/platform/s5p-cec/
 
 ARM/SAMSUNG S5P SERIES JPEG CODEC SUPPORT
 M:	Andrzej Pietrasiewicz <andrzej.p@samsung.com>