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/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index d1ff3f4..0a3983b 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -45,7 +45,7 @@
 
 static int ehci_usb_ofdata_to_platdata(struct udevice *dev)
 {
-	struct exynos_ehci_platdata *plat = dev_get_platdata(dev);
+	struct exynos_ehci_platdata *plat = dev_get_plat(dev);
 	const void *blob = gd->fdt_blob;
 	unsigned int node;
 	int depth;
@@ -214,7 +214,7 @@
 
 static int ehci_usb_probe(struct udevice *dev)
 {
-	struct exynos_ehci_platdata *plat = dev_get_platdata(dev);
+	struct exynos_ehci_platdata *plat = dev_get_plat(dev);
 	struct exynos_ehci *ctx = dev_get_priv(dev);
 	struct ehci_hcor *hcor;