ARM: dts: rmobile: Fix duplicate definition SDHI on M3N

SDHI definition fixed at commit cbff9f8
 ("ARM: dts: rmobile: Sync Gen3 DTS with Linux v4.19.6").
This patch removes SDHI defined in "arch/arm/dts/
r8a77965-u-boot.dtsi" and activates the overlap code defined in
"arch/arm/dts/salvator-common.dtsi" and "arch/arm/dts/ulcb.dtsi".

Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>

arch/arm/dts/r8a77965-u-boot.dtsi

@@ -20,50 +20,6 @@
 		status = "disabled";
 	};
 
-	sdhi0: sd@ee100000 {
-		compatible = "renesas,sdhi-r8a77965";
-		reg = <0 0xee100000 0 0x2000>;
-		interrupts = <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&cpg CPG_MOD 314>;
-		max-frequency = <200000000>;
-		power-domains = <&sysc 32>;
-		resets = <&cpg 314>;
-		status = "disabled";
-	};
-
-	sdhi1: sd@ee120000 {
-		compatible = "renesas,sdhi-r8a77965";
-		reg = <0 0xee120000 0 0x2000>;
-		interrupts = <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&cpg CPG_MOD 313>;
-		max-frequency = <200000000>;
-		power-domains = <&sysc 32>;
-		resets = <&cpg 313>;
-		status = "disabled";
-	};
-
-	sdhi2: sd@ee140000 {
-		compatible = "renesas,sdhi-r8a77965";
-		reg = <0 0xee140000 0 0x2000>;
-		interrupts = <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&cpg CPG_MOD 312>;
-		max-frequency = <200000000>;
-		power-domains = <&sysc 32>;
-		resets = <&cpg 312>;
-		status = "disabled";
-	};
-
-	sdhi3: sd@ee160000 {
-		compatible = "renesas,sdhi-r8a77965";
-		reg = <0 0xee160000 0 0x2000>;
-		interrupts = <GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
-		clocks = <&cpg CPG_MOD 311>;
-		max-frequency = <200000000>;
-		power-domains = <&sysc 32>;
-		resets = <&cpg 311>;
-		status = "disabled";
-	};
-
 	ehci0: usb@ee080100 {
 		compatible = "generic-ehci";
 		reg = <0 0xee080100 0 0x100>;