dt-bindings: power: supply: Revise Richtek RT9467 compatible name

Revise RT9467 compatible name from "richtek,rt9467-charger" to
"richtek,rt9467" because it has to match the "compatible name" in
the source code.

Fixes: e1b4620fb503 ("dt-bindings: power: supply: Add Richtek RT9467 battery charger")
Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>