dm: regulator: uclass driver code cleanup

This cleanup includes:
- remove of the preprocessor macros which pointed to long name functions
- update of the names of some regulator uclass driver functions
- cleanup of the function regulator_autoset()
- reword of some comments of regulator uclass header file
- regulator_get_by_platname: check error for uclass_find_* function calls
- add function: regulator_name_is_unique
- regulator post_bind(): check regulator name uniqueness
- fix mistakes in: regulator/Kconfig
- regulator.h: update comments
- odroid u3: cleanup the regulator calls

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested on sandbox:
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 54ce188..fd3cf35 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -14,7 +14,7 @@
 	It's important to call the device_bind() with the proper node offset,
 	when binding the regulator devices. The pmic_bind_childs() can be used
 	for this purpose if PMIC I/O driver is implemented or dm_scan_fdt_node()
-	otherwise. Detailed informations can be found in the header file.
+	otherwise. Detailed information can be found in the header file.
 
 config DM_REGULATOR_MAX77686
 	bool "Enable Driver Model for REGULATOR MAX77686"