dma-buf: Fix a typo in Kconfig

A 'h' ismissing in' syncronization'
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200216114708.20583-1-christophe.jaillet@wanadoo.fr

drivers/dma-buf/Kconfig

@@ -6,7 +6,7 @@ config SYNC_FILE
 	default n
 	select DMA_SHARED_BUFFER
 	---help---
-	  The Sync File Framework adds explicit syncronization via
+	  The Sync File Framework adds explicit synchronization via
 	  userspace. It enables send/receive 'struct dma_fence' objects to/from
 	  userspace via Sync File fds for synchronization between drivers via
 	  userspace components. It has been ported from Android.