power: regulator: update comments for regulator-name

We do not need that "regulator-name" property must be provided in dts.
If "regulator-name" property is not provided in dts, node name
will chosen for settings '.name' field of uc_pdata.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/include/power/regulator.h b/include/power/regulator.h
index 0152290..1a51c3f 100644
--- a/include/power/regulator.h
+++ b/include/power/regulator.h
@@ -46,6 +46,7 @@
  * Note: For the proper operation, at least name constraint is needed, since
  * it can be used when calling regulator_get_by_platname(). And the mandatory
  * rule for this name is, that it must be globally unique for the single dts.
+ * If regulator-name property is not provided, node name will be chosen.
  *
  * Regulator bind:
  * For each regulator device, the device_bind() should be called with passed