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/sifive/fu540/fu540.c b/board/sifive/fu540/fu540.c
index 54e5a4c..a4e7822 100644
--- a/board/sifive/fu540/fu540.c
+++ b/board/sifive/fu540/fu540.c
@@ -58,7 +58,7 @@
 
 	/* init OTP */
 	ret = uclass_get_device_by_driver(UCLASS_MISC,
-					  DM_GET_DRIVER(sifive_otp), &dev);
+					  DM_DRIVER_GET(sifive_otp), &dev);
 
 	if (ret) {
 		debug("%s: could not find otp device\n", __func__);