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/power/regulator/s2mps11_regulator.c b/drivers/power/regulator/s2mps11_regulator.c
index a6b4f15..1c6d835 100644
--- a/drivers/power/regulator/s2mps11_regulator.c
+++ b/drivers/power/regulator/s2mps11_regulator.c
@@ -305,9 +305,9 @@
 
 static int s2mps11_buck_probe(struct udevice *dev)
 {
-	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct dm_regulator_uclass_plat *uc_pdata;
 
-	uc_pdata = dev_get_uclass_platdata(dev);
+	uc_pdata = dev_get_uclass_plat(dev);
 
 	uc_pdata->type = REGULATOR_TYPE_BUCK;
 	uc_pdata->mode = s2mps11_buck_modes;
@@ -581,9 +581,9 @@
 
 static int s2mps11_ldo_probe(struct udevice *dev)
 {
-	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct dm_regulator_uclass_plat *uc_pdata;
 
-	uc_pdata = dev_get_uclass_platdata(dev);
+	uc_pdata = dev_get_uclass_plat(dev);
 	uc_pdata->type = REGULATOR_TYPE_LDO;
 	uc_pdata->mode = s2mps11_ldo_modes;
 	uc_pdata->mode_count = ARRAY_SIZE(s2mps11_ldo_modes);