usb: mtu3: Fix spelling mistake "disabed" -> "disabled"

The variable u3_ports_disabed contains a spelling mistake,
rename it to u3_ports_disabled.

Reviewed-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210311092529.4898-1-colin.king@canonical.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>