thunderbolt: No need to include <linux/acpi.h> in usb4_port.c

This include is not needed so drop it.

Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>