arm: dts: ls1028a-{rdb, qds}: remove dm-pre-reloc property

Nowadays, both boards boot using the TF-A BL1/BL2 and SPL isn't used at
all. The property is not needed, remove it.
Signed-off-by: NMichael Walle <michael@walle.cc>
Reviewed-by: NVladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: NPriyanka Jain <priyanka.jain@nxp.com>

arch/arm/dts/fsl-ls1028a-qds.dtsi

@@ -130,7 +130,6 @@
 
 &i2c0 {
 	status = "okay";
-	u-boot,dm-pre-reloc;
 
 	fpga@66 {
 		#address-cells = <1>;

arch/arm/dts/fsl-ls1028a-rdb.dts

@@ -61,7 +61,6 @@
 
 &i2c0 {
 	status = "okay";
-	u-boot,dm-pre-reloc;
 
 	 i2c-mux@77 {