usb: fix CONFIG_SYS_MPC83xx_USB_ADDR not defined error

fix a stray CONFIG_MPC83XX that escaped commit
0f898604945af4543c1525fc33b6bae621a3b805.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Remy Bohmer <linux@bohmer.net>
1 file changed