ARM: ux500: Supply external regulator names for Snowball's DT

Regulator names are platform independent, so they need to be applied to
the base level platform DTS files *.dts. Here we're supplying the names
for the newly described AB8500 external regulators.

Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

arch/arm/boot/dts/snowball.dts

···
 					compatible = "stericsson,ab8500-gpio";
 				};
 
+				ext_regulators: ab8500-ext-regulators {
+					ab8500_ext1_reg: ab8500_ext1 {
+						regulator-name = "ab8500-ext-supply1";
+					};
+
+					ab8500_ext2_reg_reg: ab8500_ext2 {
+						regulator-name = "ab8500-ext-supply2";
+					};
+
+					ab8500_ext3_reg_reg: ab8500_ext3 {
+						regulator-name = "ab8500-ext-supply3";
+					};
+				};
+
 				ab8500-regulators {
 					ab8500_ldo_aux1_reg: ab8500_ldo_aux1 {
 						regulator-name = "V-DISPLAY";