thunderbolt: Use correct function to calculate maximum USB3 link rate

thunderbolt: Use correct function to calculate maximum USB3 link rate

commit e8ff07fb33026c5c1bb5b81293496faba5d68059 upstream.

We need to take minimum of both sides of the USB3 link into consideration,
not just the downstream port. Fix this by calling tb_usb3_max_link_rate()
instead.

Fixes: 76ce95b8db58 ("thunderbolt: Add USB3 bandwidth management")
Cc: stable@vger.kernel.org
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>