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/include/net.h b/include/net.h
index aff6674..13da69b 100644
--- a/include/net.h
+++ b/include/net.h
@@ -115,7 +115,7 @@
  * @enetaddr: The Ethernet MAC address that is loaded from EEPROM or env
  * @phy_interface: PHY interface to use - see PHY_INTERFACE_MODE_...
  * @max_speed: Maximum speed of Ethernet connection supported by MAC
- * @priv_pdata: device specific platdata
+ * @priv_pdata: device specific plat
  */
 struct eth_pdata {
 	phys_addr_t iobase;