dm: Rename DM_GET_DRIVER() to DM_DRIVER_GET()

In the spirit of using the same base name for all of these related macros,
rename this to have the operation at the end. This is not widely used so
the impact is fairly small.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/google/gru/gru.c b/board/google/gru/gru.c
index 441a1a3..23080c1 100644
--- a/board/google/gru/gru.c
+++ b/board/google/gru/gru.c
@@ -45,7 +45,7 @@
 	 * setting up.
 	 */
 	ret = uclass_get_device_by_driver(UCLASS_CLK,
-					  DM_GET_DRIVER(clk_rk3399), &clk);
+					  DM_DRIVER_GET(clk_rk3399), &clk);
 	if (ret) {
 		debug("%s: CLK init failed: %d\n", __func__, ret);
 		return ret;