hikey: Add hardware/ti/wpan code to hikey device dir

The bluetooth userspace for hikey is related but newer
then the hardware/ti/wpan project in AOSP. Since we have
some hikey specific modifications, import the hikey version
into the device/linaro/hikey directory and tweak the build
to include it.

Code included from:
https://github.com/96boards/android_hardware_ti_wpan.git marshmallow-dev

Change-Id: I6246be43cb287bfd975b099a0e6508046e6d3add
Signed-off-by: John Stultz <john.stultz@linaro.org>
10 files changed