Fix 'mount' issues with persist partition for Nandwrite

Change-Id: I6e598bf60ca53b8eea2da8a8b1f9a1dd237dcace
diff --git a/app/nandwrite/nandwrite.c b/app/nandwrite/nandwrite.c
index 0855479..e262470 100644
--- a/app/nandwrite/nandwrite.c
+++ b/app/nandwrite/nandwrite.c
@@ -112,7 +112,7 @@
 		}
 	}
 
-	if (!strcmp(ptn->name, "system") || !strcmp(ptn->name, "userdata"))
+	if (!strcmp(ptn->name, "system") || !strcmp(ptn->name, "userdata") || !strcmp(ptn->name, "persist"))
 		extra = ((page_size >> 9) * 16);
 	else
 		sz = ROUND_TO_PAGE(sz, page_mask);