arm64: dts: rockchip: remove num-slots property from rk3399-sapphire

When adding the rk3399 sapphire som, two more of the recently removed
num-slots properties of dw-mmc nodes slipped in.
Remove them again.

Fixes: 8164a84c ("arm64: dts: rockchip: Add support for rk3399 sapphire SOM")
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi

@@ -530,7 +530,6 @@ &sdio0 {
 	max-frequency = <50000000>;
 	mmc-pwrseq = <&sdio_pwrseq>;
 	non-removable;
-	num-slots = <1>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&sdio0_bus4 &sdio0_cmd &sdio0_clk>;
 	sd-uhs-sdr104;
@@ -544,7 +543,6 @@ &sdmmc {
 	clock-frequency = <150000000>;
 	disable-wp;
 	max-frequency = <150000000>;
-	num-slots = <1>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_cd &sdmmc_bus4>;
 	vqmmc-supply = <&vcc_sdio>;