drm/i915: Consolidate binding parameters into flags

Anything more than just one bool parameter is just a pain to read,
symbolic constants are much better.

Split out from Chris' vma-binding rework patch.

v2: Undo the behaviour change in object_pin that Chris spotted.

v3: Split out misplaced hunk to handle set_cache_level errors,
spotted by Jani.

v4: Keep the current over-zealous binding logic in the execbuffer code
working with a quick hack while the overall binding code gets shuffled
around.

v5: Reorder the PIN_ flags for more natural patch splitup.

v6: Pull out the PIN_GLOBAL split-up again.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ben Widawsky <benjamin.widawsky@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 19fd362..f8c21a6 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -258,8 +258,7 @@
 		 * context.
 		 */
 		ret = i915_gem_obj_ggtt_pin(ctx->obj,
-					    get_context_alignment(dev),
-					    false, false);
+					    get_context_alignment(dev), 0);
 		if (ret) {
 			DRM_DEBUG_DRIVER("Couldn't pin %d\n", ret);
 			goto err_destroy;
@@ -335,8 +334,7 @@
 
 		if (i == RCS) {
 			WARN_ON(i915_gem_obj_ggtt_pin(dctx->obj,
-						      get_context_alignment(dev),
-						      false, false));
+						      get_context_alignment(dev), 0));
 			/* Fake a finish/inactive */
 			dctx->obj->base.write_domain = 0;
 			dctx->obj->active = 0;
@@ -612,8 +610,7 @@
 	/* Trying to pin first makes error handling easier. */
 	if (ring == &dev_priv->ring[RCS]) {
 		ret = i915_gem_obj_ggtt_pin(to->obj,
-					    get_context_alignment(ring->dev),
-					    false, false);
+					    get_context_alignment(ring->dev), 0);
 		if (ret)
 			return ret;
 	}