soc: renesas: Use bitfield helpers

Use the field_get() helper, instead of open-coding the same operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>

Author: geertu

drivers/soc/renesas/renesas-soc.c

@@ -5,6 +5,7 @@
  * Copyright (C) 2014-2016 Glider bvba
  */
 
+#include <linux/bitfield.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -524,8 +525,7 @@ static int __init renesas_soc_init(void)
 							   eshi, eslo);
 		}
 
-		if (soc->id &&
-		    ((product & id->mask) >> __ffs(id->mask)) != soc->id) {
+		if (soc->id && field_get(id->mask, product) != soc->id) {
 			pr_warn("SoC mismatch (product = 0x%x)\n", product);
 			ret = -ENODEV;
 			goto free_soc_dev_attr;