Fix several typos in drivers/

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/ieee1394/Kconfig b/drivers/ieee1394/Kconfig
index 2769e50..672b92e 100644
--- a/drivers/ieee1394/Kconfig
+++ b/drivers/ieee1394/Kconfig
@@ -140,7 +140,7 @@
 	help
 	  This builds sbp2 for use with non-OHCI host adapters which do not
 	  support physical DMA or for when ohci1394 is run with phys_dma=0.
-	  Physical DMA is data movement without assistence of the drivers'
+	  Physical DMA is data movement without assistance of the drivers'
 	  interrupt handlers.  This option includes the interrupt handlers
 	  that are required in absence of this hardware feature.