drm: Remove drm_modeset_legacy_acquire_ctx and crtc->acquire_ctx

With all the callers of drm_modeset_lock_crtc gone, and all the places
it was formerly used properly wiring the acquire ctx through, we can
remove this.

The only hidden context magic we still have is now the global one.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170403083304.9083-4-daniel.vetter@ffwll.ch
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e27ea89e..84abff3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10715,7 +10715,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 		state = drm_atomic_state_alloc(dev);
 		if (!state)
 			return -ENOMEM;
-		state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
+		state->acquire_ctx = dev->mode_config.acquire_ctx;
 
 retry:
 		plane_state = drm_atomic_get_plane_state(state, primary);
@@ -13075,7 +13075,7 @@ void intel_crtc_restore_mode(struct drm_crtc *crtc)
 		return;
 	}
 
-	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
+	state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
 
 retry:
 	crtc_state = drm_atomic_get_crtc_state(state, crtc);