recipes-multimedia: images: add rockchip media image
recipes-multimedia: images: add rockchip media image

A image for debugging the hardware video encoder/decoder.
I also use this image for developing the Gstreamer.

Signed-off-by: Randy Li <d9da4b1326b089e1905c19b389e4c8b735aa18ad@soulik.info>

hizukiayaka/meta-rockchip,hizukiayaka/meta-rockchip,hizukiayaka/meta-rockchip