ARM: dts: dra7-evm: Add mmc1 node for micro-sd support

Add mmc1 dt node to dra7-evm board.
Input for ldo1 regulator is controlled by gpio 5 of pcf8575 chip (0x21)
on i2c1 bus. When dt support for gpio-pcf857x is available, input supply
will be modelled as cascaded regulator.
Signed-off-by: Balaji T K <balajitk@ti.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Benoit Cousson <bcousson@baylibre.com>

arch/arm/boot/dts/dra7-evm.dts

@@ -250,3 +250,9 @@ &uart3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart3_pins>;
 };
+
+&mmc1 {
+	status = "okay";
+	vmmc-supply = <&ldo1_reg>;
+	bus-width = <4>;
+};