dt-bindings: mmc: rockchip-dw-mshc: Add compatible string for RK3506
The dw-mshc controller in the RK3506 is compatible to the one first found
in the RK3288 SoC, so add the RK3506 to the variant list.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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