drm/i915: move i915_gem_vm_lookup() where it's used

Move the function next to the only user. Arguably it's perhaps not the
best place, but it's much better than having a static inline in a
header.

Cc: Tvrtko Ursulin <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Signed-off-by: Jani Nikula <[e-mail]>
Acked-by: Tvrtko Ursulin <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/a08[e-mail]

drivers/gpu/drm/i915/gem/i915_gem_context.c

···
 	return ret;
 }
 
+static struct i915_address_space *
+i915_gem_vm_lookup(struct drm_i915_file_private *file_priv, u32 id)
+{
+	struct i915_address_space *vm;
+
+	xa_lock(&file_priv->vm_xa);
+	vm = xa_load(&file_priv->vm_xa, id);
+	if (vm)
+		kref_get(&vm->ref);
+	xa_unlock(&file_priv->vm_xa);
+
+	return vm;
+}
+
 static int set_proto_ctx_vm(struct drm_i915_file_private *fpriv,
 			    struct i915_gem_proto_context *pc,
 			    const struct drm_i915_gem_context_param *args)

drivers/gpu/drm/i915/i915_drv.h

···
 
 int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file);
 
-static inline struct i915_address_space *
-i915_gem_vm_lookup(struct drm_i915_file_private *file_priv, u32 id)
-{
-	struct i915_address_space *vm;
-
-	xa_lock(&file_priv->vm_xa);
-	vm = xa_load(&file_priv->vm_xa, id);
-	if (vm)
-		kref_get(&vm->ref);
-	xa_unlock(&file_priv->vm_xa);
-
-	return vm;
-}
-
 /* i915_gem_tiling.c */
 static inline bool i915_gem_object_needs_bit17_swizzle(struct drm_i915_gem_object *obj)
 {