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/misc/cros_ec_i2c.c b/drivers/misc/cros_ec_i2c.c
index 664bd2b..a1b78a3 100644
--- a/drivers/misc/cros_ec_i2c.c
+++ b/drivers/misc/cros_ec_i2c.c
@@ -52,7 +52,7 @@
 static int cros_ec_i2c_packet(struct udevice *udev, int out_bytes, int in_bytes)
 {
 	struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
-	struct dm_i2c_chip *chip = dev_get_parent_platdata(udev);
+	struct dm_i2c_chip *chip = dev_get_parent_plat(udev);
 	struct ec_host_request_i2c *ec_request_i2c =
 		(struct ec_host_request_i2c *)dev->dout;
 	struct ec_host_response_i2c *ec_response_i2c =
@@ -112,7 +112,7 @@
 			       int dout_len, uint8_t **dinp, int din_len)
 {
 	struct cros_ec_dev *dev = dev_get_uclass_priv(udev);
-	struct dm_i2c_chip *chip = dev_get_parent_platdata(udev);
+	struct dm_i2c_chip *chip = dev_get_parent_plat(udev);
 	struct i2c_msg i2c_msg[2];
 	/* version8, cmd8, arglen8, out8[dout_len], csum8 */
 	int out_bytes = dout_len + 4;