dma-buf: mark EXPERIMENTAL for 1st release.

Mark dma-buf buffer sharing API as EXPERIMENTAL for first release.
We will remove this in later versions, once it gets smoothed out
and has more users.
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/base/Kconfig

@@ -178,6 +178,7 @@ config DMA_SHARED_BUFFER
 	bool "Buffer framework to be shared between drivers"
 	default n
 	select ANON_INODES
+	depends on EXPERIMENTAL
 	help
 	  This option enables the framework for buffer-sharing between
 	  multiple drivers. A buffer is associated with a file using driver