Don't turn off the phone power on C2s when changing USB mode (#611)

board/boards/uno.h

@@ -72,11 +72,9 @@ void uno_set_usb_power_mode(uint8_t mode) {
   bool valid = false;
   switch (mode) {
     case USB_POWER_CLIENT:
-      uno_set_phone_power(false);
       valid = true;
       break;
     case USB_POWER_CDP:
-      uno_set_phone_power(true);
       uno_bootkick();
       valid = true;
       break;