arc: emsdp/iotdk: Switch to DM_MMC

Somehow EMSDP & IoT DK boards were skipped on ARC boads conversion
to DM MMC. So doing it now.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/arch/arc/dts/emsdp.dts b/arch/arc/dts/emsdp.dts
index d307b95..dbebdb4 100644
--- a/arch/arc/dts/emsdp.dts
+++ b/arch/arc/dts/emsdp.dts
@@ -32,4 +32,27 @@
 		reg-shift = <2>;
 		reg-io-width = <4>;
 	};
+
+	mmcclk_biu: mmcclk-biu {
+		compatible = "fixed-clock";
+		clock-frequency = <50000000>;
+		#clock-cells = <0>;
+	};
+
+	mmcclk_ciu: mmcclk-ciu {
+		compatible = "fixed-clock";
+		clock-frequency = <100000000>;
+		#clock-cells = <0>;
+	};
+
+	mmc: mmc0@f0010000 {
+		compatible = "snps,dw-mshc";
+		reg = <0xf0010000 0x400>;
+		bus-width = <4>;
+		fifo-depth = <256>;
+		clocks = <&mmcclk_biu>, <&mmcclk_ciu>;
+		clock-names = "biu", "ciu";
+		max-frequency = <25000000>;
+	};
+
 };