ARM: dts: ux500: Remove ab8500_ldo_usb regulator from device tree

Support for the USB regulator of AB8500 was removed in
commit 41a06aa738ad ("regulator: ab8500: Remove USB regulator").
However, the configuration was never removed from the device tree.

It does no longer have any effect, remove it from the device tree.

Signed-off-by: Stephan Gerhold <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

arch/arm/boot/dts/ste-ab8500.dtsi

···
 					ab8500_ldo_tvout_reg: ab8500_ldo_tvout {
 					};
 
-					// supply for ab8500-usb; USB LDO
-					ab8500_ldo_usb_reg: ab8500_ldo_usb {
-					};
-
 					// supply for ab8500-vaudio; VAUDIO LDO
 					ab8500_ldo_audio_reg: ab8500_ldo_audio {
 					};

arch/arm/boot/dts/ste-href.dtsi

···
 						regulator-name = "V-TVOUT";
 					};
 
-					ab8500_ldo_usb_reg: ab8500_ldo_usb {
-						regulator-name = "dummy";
-					};
-
 					ab8500_ldo_audio_reg: ab8500_ldo_audio {
 						regulator-name = "V-AUD";
 					};

arch/arm/boot/dts/ste-snowball.dts

···
 						regulator-name = "V-TVOUT";
 					};
 
-					ab8500_ldo_usb_reg: ab8500_ldo_usb {
-						regulator-name = "dummy";
-					};
-
 					ab8500_ldo_audio_reg: ab8500_ldo_audio {
 						regulator-name = "V-AUD";
 					};