documentation: da9052: Update regulator bindings names to match DA9052/53 DTS expectations

Buck and LDO binding name changes.

The binding names for the regulators have been changed to match the current
expectation from existing device tree source files.

This fix rectifies the disparity between what currently exists in some
.dts[i] board files and what is listed in this binding document. This
change re-aligns those differences and also brings the binding document
in-line with the expectations of the product datasheet from Dialog
Semiconductor.

Bucks and LDOs now follow the expected notation:
{ buck1, buck2, buck3, buck4 }
{ ldo1, ldo2, ldo3, ldo4, ldo5, ldo6, ldo7, ldo8, ldo9, ldo10 }

Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/mfd/da9052-i2c.txt

@@ -8,10 +8,13 @@ Sub-nodes:
 - regulators : Contain the regulator nodes. The DA9052/53 regulators are
   bound using their names as listed below:
 
-    buck0     : regulator BUCK0
-    buck1     : regulator BUCK1
-    buck2     : regulator BUCK2
-    buck3     : regulator BUCK3
+    buck1     : regulator BUCK CORE
+    buck2     : regulator BUCK PRO
+    buck3     : regulator BUCK MEM
+    buck4     : regulator BUCK PERI
+    ldo1      : regulator LDO1
+    ldo2      : regulator LDO2
+    ldo3      : regulator LDO3
     ldo4      : regulator LDO4
     ldo5      : regulator LDO5
     ldo6      : regulator LDO6
@@ -19,9 +22,6 @@ Sub-nodes:
     ldo8      : regulator LDO8
     ldo9      : regulator LDO9
     ldo10     : regulator LDO10
-    ldo11     : regulator LDO11
-    ldo12     : regulator LDO12
-    ldo13     : regulator LDO13
 
   The bindings details of individual regulator device can be found in:
   Documentation/devicetree/bindings/regulator/regulator.txt
@@ -36,22 +36,22 @@ i2c@63fc8000 { /* I2C1 */
 		reg = <0x48>;
 
 		regulators {
-			buck0 {
+			buck1 {
 				regulator-min-microvolt = <500000>;
 				regulator-max-microvolt = <2075000>;
 			};
 
-			buck1 {
+			buck2 {
 				regulator-min-microvolt = <500000>;
 				regulator-max-microvolt = <2075000>;
 			};
 
-			buck2 {
+			buck3 {
 				regulator-min-microvolt = <925000>;
 				regulator-max-microvolt = <2500000>;
 			};
 
-			buck3 {
+			buck4 {
 				regulator-min-microvolt = <925000>;
 				regulator-max-microvolt = <2500000>;
 			};