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/mmc/rockchip_dw_mmc.c b/drivers/mmc/rockchip_dw_mmc.c
index e4c5288..67eb89b 100644
--- a/drivers/mmc/rockchip_dw_mmc.c
+++ b/drivers/mmc/rockchip_dw_mmc.c
@@ -177,7 +177,7 @@
 	.bind		= rockchip_dwmmc_bind,
 	.probe		= rockchip_dwmmc_probe,
 	.priv_auto	= sizeof(struct rockchip_dwmmc_priv),
-	.platdata_auto	= sizeof(struct rockchip_mmc_plat),
+	.plat_auto	= sizeof(struct rockchip_mmc_plat),
 };
 
 U_BOOT_DRIVER_ALIAS(rockchip_rk3288_dw_mshc, rockchip_rk3328_dw_mshc)