dt-bindings: input: sun4i-lradc-keys: Add H616 compatible

dt-bindings: input: sun4i-lradc-keys: Add H616 compatible

The Allwinner H616 SoC has an LRADC which is compatible with the
versions in existing SoCs.
Add a compatible string for H616, with the R329 fallback. This is the
same as the D1, so put them into an enum.

Signed-off-by: James McGregor <jamcgregor@protonmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240426092924.15489-2-jamcgregor@protonmail.com
Signed-off-by: Chen-Yu Tsai <wens@csie.org>