drm/i915: Remove erroneous i915_is_ggtt check for I915_GEM_OBJECT_UNBIND_VM_TRYLOCK

We changed the locking hierarchy for both ppgtt and ggtt, so both locks
should be trylocked inside i915_gem_object_unbind().
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: bc6f80cc ("drm/i915: Use trylock in shrinker for ggtt on bsw vt-d and bxt, v2.")
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210429120158.1105318-1-maarten.lankhorst@linux.intel.com
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> #irc

drivers/gpu/drm/i915/i915_gem.c

@@ -158,8 +158,7 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
 			ret = -EBUSY;
 			if (flags & I915_GEM_OBJECT_UNBIND_ACTIVE ||
 			    !i915_vma_is_active(vma)) {
-				if (i915_is_ggtt(vma->vm) &&
-				    flags & I915_GEM_OBJECT_UNBIND_VM_TRYLOCK) {
+				if (flags & I915_GEM_OBJECT_UNBIND_VM_TRYLOCK) {
 					if (mutex_trylock(&vma->vm->mutex)) {
 						ret = __i915_vma_unbind(vma);
 						mutex_unlock(&vma->vm->mutex);