dts: 820c: Add pinctrl node and uart mux

* Add pinctrl node for TLMM and add mux request for uart node.
* Rename uart to the actual board uart port.
* Fix indentendation of sdhc2 node.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
diff --git a/arch/arm/dts/dragonboard820c-uboot.dtsi b/arch/arm/dts/dragonboard820c-uboot.dtsi
index d60aa04..8610d7e 100644
--- a/arch/arm/dts/dragonboard820c-uboot.dtsi
+++ b/arch/arm/dts/dragonboard820c-uboot.dtsi
@@ -13,14 +13,22 @@
 	soc {
 		u-boot,dm-pre-reloc;
 
+		qcom,tlmm@1010000 {
+			u-boot,dm-pre-reloc;
+
+			uart {
+				u-boot,dm-pre-reloc;
+			};
+		};
+
 		clock-controller@300000 {
 			u-boot,dm-pre-reloc;
 		};
 
 		serial@75b0000 {
 			u-boot,dm-pre-reloc;
-			};
 		};
+	};
 };
 
 &pm8994_pon {