fdt: fix bcm283x dm-pre-reloc definitions

In commmit
143256b353 ("fdt: update bcm283x device tree sources to Linux 5.1-rc6 state")
we deleted the label for the node soc from bcm283x.dtsi

As we don't need to add the property dm-pre-reloc to the soc node,
we can delete it from bcm283x-uboot.dtsi

Tested-by: Tom Rini <trini@konsulko.com> [RPi 3, 32b and 64b modes]
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
diff --git a/arch/arm/dts/bcm283x-uboot.dtsi b/arch/arm/dts/bcm283x-uboot.dtsi
index 6cc1aa3..36548da 100644
--- a/arch/arm/dts/bcm283x-uboot.dtsi
+++ b/arch/arm/dts/bcm283x-uboot.dtsi
@@ -6,10 +6,6 @@
  * (C) Copyright 2016 Fabian Vogt <fvogt@suse.com>
  */
 
-&soc {
-	u-boot,dm-pre-reloc;
-};
-
 &uart0 {
 	skip-init;
 	u-boot,dm-pre-reloc;