spl: sdp: Pass the USB index to board_usb_init()

board_usb_init() should receive the controller_index as its
first parameter instead of having it hardcoded as 0.

All in-tree users have CONFIG_SPL_SDP_USB_DEV as 0, so this error
should not affect any board.

Fix it by passing controller_index as the parameter of board_usb_init().

Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Peng Fan <peng.fan@nxp.com>