mips: dts: pic32: pic32mzda: Rename the sdhci nodename to match with common mmc-controller binding

Rename the sdhci nodename from "sdhci@" to "mmc@" to align with
linux common mmc-controller binding.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: Charan-Pedumuru

arch/mips/boot/dts/pic32/pic32mzda.dtsi

@@ -225,7 +225,7 @@
 		gpio-ranges = <&pic32_pinctrl 0 144 16>;
 	};
 
-	sdhci: sdhci@1f8ec000 {
+	sdhci: mmc@1f8ec000 {
 		compatible = "microchip,pic32mzda-sdhci";
 		reg = <0x1f8ec000 0x100>;
 		interrupts = <191 IRQ_TYPE_LEVEL_HIGH>;