dma: Kconfig: Include mx6 in the IMX_SDMA help section

MX6 processors also use the IMX_SDMA driver, so include it in the help text.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/Kconfig

@@ -270,7 +270,7 @@ config IMX_SDMA
 	select DMA_ENGINE
 	help
 	  Support the i.MX SDMA engine. This engine is integrated into
-	  Freescale i.MX25/31/35/51/53 chips.
+	  Freescale i.MX25/31/35/51/53/6 chips.
 
 config IMX_DMA
 	tristate "i.MX DMA support"