dm: treewide: Rename dev_get_platdata() to dev_get_plat()

Rename this to be consistent with the change from 'platdata'.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/video.c b/test/dm/video.c
index 1af948d..da0ae36 100644
--- a/test/dm/video.c
+++ b/test/dm/video.c
@@ -107,7 +107,7 @@
 
 	ut_assertok(uclass_find_device(UCLASS_VIDEO, 0, &dev));
 	ut_assert(!device_active(dev));
-	plat = dev_get_platdata(dev);
+	plat = dev_get_plat(dev);
 	plat->vidconsole_drv_name = "vidconsole0";
 
 	return 0;
@@ -217,7 +217,7 @@
 
 	ut_assertok(uclass_find_device(UCLASS_VIDEO, 0, &dev));
 	ut_assert(!device_active(dev));
-	plat = dev_get_platdata(dev);
+	plat = dev_get_plat(dev);
 	plat->rot = rot;
 
 	ut_assertok(uclass_get_device(UCLASS_VIDEO, 0, &dev));
@@ -359,7 +359,7 @@
 
 	ut_assertok(uclass_find_device(UCLASS_VIDEO, 0, &dev));
 	ut_assert(!device_active(dev));
-	plat = dev_get_platdata(dev);
+	plat = dev_get_plat(dev);
 	plat->font_size = 100;
 
 	ut_assertok(uclass_get_device(UCLASS_VIDEO, 0, &dev));
@@ -380,7 +380,7 @@
 
 	ut_assertok(uclass_find_device(UCLASS_VIDEO, 0, &dev));
 	ut_assert(!device_active(dev));
-	plat = dev_get_platdata(dev);
+	plat = dev_get_plat(dev);
 	plat->font_size = 100;
 
 	ut_assertok(uclass_get_device(UCLASS_VIDEO, 0, &dev));