FROMGIT: usb: split code locating ACPI companion into port and device

In preparation for handling embedded USB devices let's split
usb_acpi_find_companion() into usb_acpi_find_companion_for_device() and
usb_acpi_find_companion_for_port().

Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Rajat Jain <rajatja@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
(cherry picked from commit bcfcd409
 git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master)

BUG=b:80089559
TEST=Test by simulating BT timeouts by instrumenting the kernel

Change-Id: I145121f44d15719fb35cc8b11320b32a158f557f
Reviewed-on: https://chromium-review.googlesource.com/1435749


Commit-Ready: Rajat Jain <rajatja@chromium.org>
Tested-by: Rajat Jain <rajatja@chromium.org>
Reviewed-by: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@chromium.org>