dm: treewide: Rename 'platdata' variables to just 'plat'

We use 'priv' for private data but often use 'platdata' for platform data.
We can't really use 'pdata' since that is ambiguous (it could mean private
or platform data).

Rename some of the latter variables to end with 'plat' for consistency.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/rockchip/rk_vop.c b/drivers/video/rockchip/rk_vop.c
index 6475b3e..c20d158 100644
--- a/drivers/video/rockchip/rk_vop.c
+++ b/drivers/video/rockchip/rk_vop.c
@@ -283,7 +283,7 @@
 			break;
 	};
 
-	disp_uc_plat = dev_get_uclass_platdata(disp);
+	disp_uc_plat = dev_get_uclass_plat(disp);
 	debug("Found device '%s', disp_uc_priv=%p\n", disp->name, disp_uc_plat);
 	if (display_in_use(disp)) {
 		debug("   - device in use\n");
@@ -364,7 +364,7 @@
 
 int rk_vop_probe(struct udevice *dev)
 {
-	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	struct video_uc_platdata *plat = dev_get_uclass_plat(dev);
 	struct rk_vop_priv *priv = dev_get_priv(dev);
 	int ret = 0;
 	ofnode port, node;
@@ -406,7 +406,7 @@
 
 int rk_vop_bind(struct udevice *dev)
 {
-	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	struct video_uc_platdata *plat = dev_get_uclass_plat(dev);
 
 	plat->size = 4 * (CONFIG_VIDEO_ROCKCHIP_MAX_XRES *
 			  CONFIG_VIDEO_ROCKCHIP_MAX_YRES);