drm/i915: Permit pinning whilst the device is 'suspended'

As pinning (allocating and binding GTT memory) does not actually invoke
GPU commands, it is safe, and indeed is attempted, during resumption
from suspension:

  [drm:intel_init_clock_gating] *ERROR* failed to pin power context: -16
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Reported-by: NHugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: stable@kernel.org
Signed-off-by: NEric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/i915_gem.c

@@ -2582,9 +2582,6 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
 	bool retry_alloc = false;
 	int ret;
 
-	if (dev_priv->mm.suspended)
-		return -EBUSY;
-
 	if (obj_priv->madv != I915_MADV_WILLNEED) {
 		DRM_ERROR("Attempting to bind a purgeable object\n");
 		return -EINVAL;