ARM: shmobile: r8a7790: Rename mmcif node to mmc

Node names should describe the function of the device, not its IP core
name.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7790.dtsi

@@ -392,7 +392,7 @@ iic3: i2c@e60b0000 {
 		status = "disabled";
 	};
 
-	mmcif0: mmcif@ee200000 {
+	mmcif0: mmc@ee200000 {
 		compatible = "renesas,mmcif-r8a7790", "renesas,sh-mmcif";
 		reg = <0 0xee200000 0 0x80>;
 		interrupts = <0 169 IRQ_TYPE_LEVEL_HIGH>;