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/test/dm/test-fdt.c b/test/dm/test-fdt.c
index 711bf20..b535390 100644
--- a/test/dm/test-fdt.c
+++ b/test/dm/test-fdt.c
@@ -328,7 +328,7 @@
 
 	/* Check creating a device with an alias */
 	node = ofnode_path("/some-bus/c-test@1");
-	ut_assertok(device_bind(dm_root(), DM_GET_DRIVER(testfdt_drv),
+	ut_assertok(device_bind(dm_root(), DM_DRIVER_GET(testfdt_drv),
 				"c-test@1", NULL, node, &dev));
 	ut_asserteq(12, dev_seq(dev));
 	ut_assertok(uclass_get_device_by_seq(UCLASS_TEST_FDT, 12, &dev));
@@ -348,11 +348,11 @@
 	 *
 	 * So next available is 19
 	 */
-	ut_assertok(device_bind(dm_root(), DM_GET_DRIVER(testfdt_drv),
+	ut_assertok(device_bind(dm_root(), DM_DRIVER_GET(testfdt_drv),
 				"fred", NULL, ofnode_null(), &dev));
 	ut_asserteq(19, dev_seq(dev));
 
-	ut_assertok(device_bind(dm_root(), DM_GET_DRIVER(testfdt_drv),
+	ut_assertok(device_bind(dm_root(), DM_DRIVER_GET(testfdt_drv),
 				"fred2", NULL, ofnode_null(), &dev));
 	ut_asserteq(20, dev_seq(dev));