nios2: Remove unnecessary of_platform_populate with default match table

After patch "of/platform: Add common method to populate default bus",
it is possible for arch code to remove unnecessary callers of
of_platform_populate with default match table.

Cc: Ley Foon Tan <lftan@altera.com>
Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NRob Herring <robh@kernel.org>

arch/nios2/platform/platform.c

@@ -9,7 +9,6 @@
  */
 
 #include <linux/init.h>
-#include <linux/of_platform.h>
 #include <linux/of_address.h>
 #include <linux/of_fdt.h>
 #include <linux/err.h>
@@ -39,8 +38,7 @@ static int __init nios2_soc_device_init(void)
 		}
 	}
 
-	return of_platform_populate(NULL, of_default_bus_match_table,
-		NULL, NULL);
+	return 0;
 }
 
 device_initcall(nios2_soc_device_init);