arm: dts: socfpga: Add u-boot, dm-pre-reloc for sysmgr and clkmgr nodes

Add u-boot,dm-pre-reloc for sysmgr and clkmgr nodes to use it in SPL.
In preparation to get base address from DT.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
diff --git a/arch/arm/dts/socfpga_arria10_socdk.dtsi b/arch/arm/dts/socfpga_arria10_socdk.dtsi
index 6e5578d..ef10708 100644
--- a/arch/arm/dts/socfpga_arria10_socdk.dtsi
+++ b/arch/arm/dts/socfpga_arria10_socdk.dtsi
@@ -180,3 +180,11 @@
 &l4_sp_clk {
 	u-boot,dm-pre-reloc;
 };
+
+&clkmgr {
+	u-boot,dm-pre-reloc;
+};
+
+&sysmgr {
+	u-boot,dm-pre-reloc;
+};