dm: treewide: Rename ..._platdata variables to just ..._plat

Try to maintain some consistency between these variables by using _plat as
a suffix for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/meson_gx_mmc.h b/drivers/mmc/meson_gx_mmc.h
index 92aec53..8974b78 100644
--- a/drivers/mmc/meson_gx_mmc.h
+++ b/drivers/mmc/meson_gx_mmc.h
@@ -84,7 +84,7 @@
 #define MESON_SD_EMMC_CMD_RSP2		0x64
 #define MESON_SD_EMMC_CMD_RSP3		0x68
 
-struct meson_mmc_platdata {
+struct meson_mmc_plat {
 	struct mmc_config cfg;
 	struct mmc mmc;
 	void *regbase;