balloon3_udc_init() tries to register a balloon3_gpio_vbus
device, but this has never been defined in the mainline
kernel. To avoid the obvious build failure when this function
is enabled, remove the bogus reference here.
Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Daniel Mack <zonque@gmail.com>