arm64: a37xx: dts: Add additional pinctrl definition

Add mmc pins, pcie pins and sdio pins definition and do these pins'
configuration for DB board and espressobin board;
Add uart2 pins configuration for DB board.

Reviewed-on: http://vgitil04.il.marvell.com:8080/40914
Reviewed-by: Wilson Ding <dingwei@marvell.com>
Tested-by: Wilson Ding <dingwei@marvell.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>

arch/arm/dts/armada-3720-db.dts

@@ -100,6 +100,8 @@
 
 &sdhci0 {
 	bus-width = <4>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdio_pins>;
 	status = "okay";
 };
 
@@ -109,6 +111,8 @@
 	mmc-ddr-1_8v;
 	mmc-hs400-1_8v;
 	marvell,pad-type = "fixed-1-8v";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mmc_pins>;
 	status = "okay";
 
 	#address-cells = <1>;

arch/arm/dts/armada-37xx.dtsi

@@ -155,6 +155,11 @@
 					groups = "uart2";
 					function = "uart";
 				};
+
+				mmc_pins: mmc-pins {
+					groups = "emmc_nb";
+					function = "emmc";
+				};
 			};
 
 			pinctrl_sb: pinctrl-sb@18800 {
@@ -178,6 +183,15 @@
 					function = "mii";
 				};
 
+				sdio_pins: sdio-pins {
+					groups = "sdio_sb";
+					function = "sdio";
+				};
+
+				pcie_pins: pcie-pins {
+					groups = "pcie1";
+					function = "pcie";
+				};
 			};
 
 			usb3: usb@58000 {