dt-bindings: add compatible string for Allwinner V3s SoC
The compatible string for Allwinner V3s SoC used to be missing.
Add it to the binding document.
Fixes: b074fede01c0 ("arm: sunxi: add support for V3s SoC")
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Icenowy Zheng