mtd: bcm63xxpart: don't assume NVRAM is always the fourth partition

Instead of referencing the sizes of fixed partitions, use the
precomputed CFE/NVRAM lengths.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/bcm63xxpart.c b/drivers/mtd/bcm63xxpart.c
index 17e1370..6afc4aa 100644
--- a/drivers/mtd/bcm63xxpart.c
+++ b/drivers/mtd/bcm63xxpart.c
@@ -165,8 +165,8 @@
 	/* Global partition "linux" to make easy firmware upgrade */
 	curpart++;
 	parts[curpart].name = "linux";
-	parts[curpart].offset = parts[0].size;
-	parts[curpart].size = master->size - parts[0].size - parts[3].size;
+	parts[curpart].offset = cfelen;
+	parts[curpart].size = master->size - cfelen - nvramlen;
 
 	for (i = 0; i < nrparts; i++)
 		pr_info("Partition %d is %s offset %lx and length %lx\n", i,