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>
diff --git a/wpan/README b/wpan/README
new file mode 100644
index 0000000..3b45293
--- /dev/null
+++ b/wpan/README
@@ -0,0 +1,18 @@
+wpan.git contains the Bluetooth, FM code by Texas Instruments for
+WiLink connectivity chipsets on OMAP Platforms
+
+Android.mk - Root Makefile calling all subdir makefiles
+bt_sco_app - Command line application to send PCM configuruations to WL12xx chip(optional)
+and connect to BT headset via SCO.
+bt_voice_call_set - Derived from bt_sco_app for Modem purposes.
+fmradio - Stack and Command line application for FM on WiLink chipsets
+fmradio_omap3 - Derived from fmradio (older version) on OMAP3 platforms
+README - This file
+ti_st -
+	kfmapp/ - V4L2 FM application to be used with V4L2 drivers for FM on WL.
+	uim/ - User-Space Initilization Manager for TI Shared Transport Drivers (to be
+	used with kernel version 2.6.32 and below drivers)
+	uim-rfkill/ - Derived from uim/ to be used with K32 and above TI ST drivers.
+	uim-sysfs/ - User-Space Init Manager for TI Shared Transport Drivers (per kernel.org)
+tools -
+        BluetoothSCOApp/ - BT SCO UI App for connect to BT headset via SCO