dm: treewide: Rename ..._platdata variables to just ..._plat

Try to maintain some consistency between these variables by using _plat as
a suffix for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/test-main.c b/test/dm/test-main.c
index 4814e18..69458d6 100644
--- a/test/dm/test-main.c
+++ b/test/dm/test-main.c
@@ -89,7 +89,7 @@
 
 	uts->start = mallinfo();
 	if (test->flags & UT_TESTF_SCAN_PDATA)
-		ut_assertok(dm_scan_platdata(false));
+		ut_assertok(dm_scan_plat(false));
 	if (test->flags & UT_TESTF_PROBE_TEST)
 		ut_assertok(do_autoprobe(uts));
 	if (!CONFIG_IS_ENABLED(OF_PLATDATA) &&
@@ -211,7 +211,7 @@
 	gd_set_of_root(uts->of_root);
 	gd->dm_root = NULL;
 	ut_assertok(dm_init(CONFIG_IS_ENABLED(OF_LIVE)));
-	dm_scan_platdata(false);
+	dm_scan_plat(false);
 	if (!CONFIG_IS_ENABLED(OF_PLATDATA))
 		dm_scan_fdt(false);