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/power/acpi_pmc/sandbox.c b/drivers/power/acpi_pmc/sandbox.c
index 6cb7af1..8cf03f7 100644
--- a/drivers/power/acpi_pmc/sandbox.c
+++ b/drivers/power/acpi_pmc/sandbox.c
@@ -74,7 +74,7 @@
 	upriv->pmc_bar0 = map_sysmem(base, 0x2000);
 	upriv->gpe_cfg = (u32 *)(upriv->pmc_bar0 + GPIO_GPE_CFG);
 
-	return pmc_ofdata_to_uc_platdata(dev);
+	return pmc_ofdata_to_uc_plat(dev);
 }
 
 static struct acpi_pmc_ops sandbox_pmc_ops = {