dt-bindings: arm: sunxi: Add H616 EMAC0 compatible

The Allwinner H616 contains an "EMAC0" Ethernet MAC compatible to the A64
version.

Add it to the list of compatible strings.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20220708105235.3983266-2-andre.przywara@arm.com