gallium/util: don't pass a pipe_resource to util_resource_is_array_texture()

No need to pass a pipe_resource when we can just pass the target.
This makes the function potentially more usable.  Rename it too.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/auxiliary/util/u_resource.h

@@ -32,14 +32,14 @@ unsigned
 util_resource_size(const struct pipe_resource *res);
 
 /**
- * Return true if the resource is an array texture.
+ * Return true if the texture target is an array type.
  *
  * Note that this function returns true for single-layered array textures.
  */
 static inline boolean
-util_resource_is_array_texture(const struct pipe_resource *res)
+util_texture_is_array(enum pipe_texture_target target)
 {
-   switch (res->target) {
+   switch (target) {
    case PIPE_TEXTURE_1D_ARRAY:
    case PIPE_TEXTURE_2D_ARRAY:
    case PIPE_TEXTURE_CUBE_ARRAY:

src/gallium/drivers/radeon/r600_texture.c

@@ -582,7 +582,7 @@ static void si_query_opaque_metadata(struct si_screen *sscreen,
 		PIPE_SWIZZLE_W
 	};
 	uint32_t desc[8], i;
-	bool is_array = util_resource_is_array_texture(res);
+	bool is_array = util_texture_is_array(res->target);
 
 	/* DRM 2.x.x doesn't support this. */
 	if (sscreen->info.drm_major != 3)