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/cmd/i2c.c b/cmd/i2c.c
index cc01119..dc4b66d 100644
--- a/cmd/i2c.c
+++ b/cmd/i2c.c
@@ -390,7 +390,7 @@
 		ret = i2c_set_chip_offset_len(dev, alen);
 	if (ret)
 		return i2c_report_err(ret, I2C_ERR_WRITE);
-	i2c_chip = dev_get_parent_platdata(dev);
+	i2c_chip = dev_get_parent_plat(dev);
 	if (!i2c_chip)
 		return i2c_report_err(ret, I2C_ERR_WRITE);
 #endif
@@ -1707,7 +1707,7 @@
 	for (device_find_first_child(bus, &dev);
 	     dev;
 	     device_find_next_child(&dev)) {
-		struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
+		struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
 
 		printf("   %02x: %s, offset len %x, flags %x\n",
 		       chip->chip_addr, dev->name, chip->offset_len,