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/drivers/clk/clk_boston.c b/drivers/clk/clk_boston.c
index 75e2e43..374fc9a 100644
--- a/drivers/clk/clk_boston.c
+++ b/drivers/clk/clk_boston.c
@@ -28,7 +28,7 @@
 
 static ulong clk_boston_get_rate(struct clk *clk)
 {
-	struct clk_boston *state = dev_get_platdata(clk->dev);
+	struct clk_boston *state = dev_get_plat(clk->dev);
 	uint32_t in_rate, mul, div;
 	uint mmcmdiv;
 	int err;
@@ -60,7 +60,7 @@
 
 static int clk_boston_ofdata_to_platdata(struct udevice *dev)
 {
-	struct clk_boston *state = dev_get_platdata(dev);
+	struct clk_boston *state = dev_get_plat(dev);
 	struct udevice *syscon;
 	int err;