arm64: dts: allwinner: a64: Fix the video engine compatible

When introducing the video-codec node for the video engine, the
compatible for the H5 was used instead of the compatible for the
A64. Use the right compatible instead.

Fixes: d60ce247 ("arm64: dts: allwinner: a64: Add Video Engine node")
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>