media: hantro: Add linux-rockchip mailing list to MAINTAINERS

The linux-rockchip mailing list is relevant for the
Hantro driver, given this support the VPU present
in Rockchip SoCs.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

MAINTAINERS

@@ -14315,6 +14315,7 @@ F:	Documentation/devicetree/bindings/media/rockchip-rga.txt
 HANTRO VPU CODEC DRIVER
 M:	Ezequiel Garcia <ezequiel@collabora.com>
 L:	linux-media@vger.kernel.org
+L:	linux-rockchip@lists.infradead.org
 S:	Maintained
 F:	drivers/staging/media/hantro/
 F:	Documentation/devicetree/bindings/media/rockchip-vpu.txt