arm64: dts: socfpga: stratix10: fix dtbs_check for rstmgr

Add the default "altr,rst-mgr" to the rstmgr node on Stratix10.

This fixes this warning:

arch/arm64/boot/dts/altera:33:10
	rstmgr@ffd11000 (altr,stratix10-rst-mgr): compatible: 'oneOf' conditional
	failed, one must be fixed:

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

Author: Dinh Nguyen

arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi

@@ -395,7 +395,7 @@
 
 		rst: rstmgr@ffd11000 {
 			#reset-cells = <1>;
-			compatible = "altr,stratix10-rst-mgr";
+			compatible = "altr,stratix10-rst-mgr", "altr,rst-mgr";
 			reg = <0xffd11000 0x1000>;
 		};