dm: treewide: Rename dev_get_platdata() to dev_get_plat()

Rename this to be consistent with the change from 'platdata'.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/sdhci.h b/include/sdhci.h
index 69c2087..3e5a649 100644
--- a/include/sdhci.h
+++ b/include/sdhci.h
@@ -443,7 +443,7 @@
  *	.plat_auto	= sizeof(struct msm_sdhc_plat),
  *
  * To access platform data:
- *	struct msm_sdhc_plat *plat = dev_get_platdata(dev);
+ *	struct msm_sdhc_plat *plat = dev_get_plat(dev);
  *
  * See msm_sdhci.c for an example.
  *