arm64: dts: socfpga: swvp: remove altr,modrst-offset

'altr,modrst-offset' property is not applicable for arm64 SoCFPGA
platforms.

This will fix this dtbs_check warning:

socfpga_stratix10_swvp.dtb:
	rstmgr@ffd11000: altr,modrst-offset: False schema does not allow 32

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

Author: Dinh Nguyen

arch/arm64/boot/dts/altera/socfpga_stratix10_swvp.dts

@@ -103,10 +103,6 @@
 	status = "okay";
 };
 
-&rst {
-	altr,modrst-offset = <0x20>;
-};
-
 &sysmgr {
 	reg = <0xffd12000 0x1000>;
 	interrupts = <0x0 0x10 0x4>;