Rename "struct fence" to "struct dma_fence"

[Chris Wilson]

I plan to usurp the short name of struct fence for a core kernel struct,
and so I need to rename the specialised fence/timeline for DMA
operations to make room.
    
A consensus was reached in
https://lists.freedesktop.org/archives/dri-devel/2016-July/113083.html
that making clear this fence applies to DMA operations was a good thing.
Since then the patch has grown a bit as usage increases (and we wanted
to wait until after the sw_sync destage), so hopefully it remains a good
thing!
    
I've pushed the patch to

https://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=dma-fence&id=a4a27d87e4fccefb9f9d55f9c73ccab8f2ade3cc

as I suspect it might be too large for the list.

Highlights of the change:

	struct fence -> struct dma_fence (and all fence*() to dma_fence*())
	struct fence_array -> struct dma_fence_array

	107 files changed, 1174 insertions(+), 1136 deletions(-)

Mostly generated with the provided cocci spatch, but even with
--include-headers it seemed to miss some headers, and I never quite
worked out the substition commands for macros, so there is some grep and
replace.
-Chris