drm/i915: Keep a list of all contexts

I have implemented this patch before without creating a separate list
(I'm having trouble finding the links, but the messages ids are:
<[email protected]>
<[email protected]>)

However, the code is much simpler to just use a list and it makes the
code from the next patch a lot more pretty.

As you'll see in the next patch, the reason for this is to be able to
specify when a context needs to get L3 remapping. More details there.

Signed-off-by: Ben Widawsky <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

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