sf: Add lock ops for SST SPI NOR flash

SST SPI NOR flash has the same locking programming bits
as ST Micro - added support for it.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
[Minor change on commit message]
Signed-off-by: Jagan Teki <jteki@openedev.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index 384224d..4065520 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -583,7 +583,7 @@
 }
 #endif
 
-#ifdef CONFIG_SPI_FLASH_STMICRO
+#if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST)
 static void stm_get_locked_range(struct spi_flash *flash, u8 sr, loff_t *ofs,
 				 u32 *len)
 {
@@ -750,4 +750,4 @@
 
 	return 0;
 }
-#endif  /* CONFIG_SPI_FLASH_STMICRO */
+#endif