db410c: Added pre-relocation attribute to pinctrl

u-boot,dm-pre-reloc was missing from pinctrl and it's
children node. causing failure to configure pin mux
before relocation.

Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
diff --git a/arch/arm/dts/dragonboard410c-uboot.dtsi b/arch/arm/dts/dragonboard410c-uboot.dtsi
index 17ee55a..b968f5e 100644
--- a/arch/arm/dts/dragonboard410c-uboot.dtsi
+++ b/arch/arm/dts/dragonboard410c-uboot.dtsi
@@ -13,6 +13,14 @@
 	soc {
 		u-boot,dm-pre-reloc;
 
+		qcom,tlmm@1000000 {
+			u-boot,dm-pre-reloc;
+
+			uart {
+				u-boot,dm-pre-reloc;
+			};
+		};
+
 	qcom,gcc@1800000 {
 		u-boot,dm-pre-reloc;
 	};