[MTD] assume mtd->writesize is 1 for NOR flashes

Signed-off-by: Artem B. Bityitskiy
diff --git a/drivers/mtd/chips/sharp.c b/drivers/mtd/chips/sharp.c
index 3cc0b23..967abbe 100644
--- a/drivers/mtd/chips/sharp.c
+++ b/drivers/mtd/chips/sharp.c
@@ -140,6 +140,7 @@
 	mtd->suspend = sharp_suspend;
 	mtd->resume = sharp_resume;
 	mtd->flags = MTD_CAP_NORFLASH;
+	mtd->writesize = 1;
 	mtd->name = map->name;
 
 	memset(sharp, 0, sizeof(*sharp));