arm64: dts: agilex/stratix10/n5x: fix dtbs_check for rstmgr

The bindings expect "altr,rst-mgr" as a fallback in the rstmgr
compatible:

rstmgr@ffd11000: compatible: 'oneOf' conditional failed, one must be fixed:
        ['altr,stratix10-rst-mgr'] is too short
        'altr,rst-mgr' was expected
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm64/boot/dts/intel/socfpga_agilex.dtsi

@@ -376,9 +376,9 @@ pinctrl1: pinconf@ffd13100 {
 		};
 
 		rst: rstmgr@ffd11000 {
-			#reset-cells = <1>;
-			compatible = "altr,stratix10-rst-mgr";
+			compatible = "altr,stratix10-rst-mgr", "altr,rst-mgr";
 			reg = <0xffd11000 0x100>;
+			#reset-cells = <1>;
 		};
 
 		smmu: iommu@fa000000 {