ti_wpan: build wpan only if device requires it

to enable set BOARD_WPAN_DEVICE := true
Merge branch 'jb-mr1-release' of https://android.googlesource.com/platform/hardware/ti/wpan into HEAD
wpan: Adds vendor library for TI's WiLink chipsets

This patch adds minimalalistic vendor library for news
introduced Broadcom stack in Android JellyBean MR1 update.

Change-Id: Ic0b3a9470cba63b40d417bc259ef2cb276a92cf3
Signed-off-by: Manjunatha Halli <x0130808@ti.com>
libbt-vendor: rework structure of source code

Before complete implementation rework basic structure of code:
  - split actions to related functions
  - implement constants
  - remove useless log message
There aren't changes in logic.

Change-Id: I9cfa0782f78839f94085ab7d1b561925f34b5765
Signed-off-by: Andrii Beregovenko <a.beregovenko@ti.com>
wpan: Enable flag check for FM app

Some devices need to provide a modified version of the FM app

Change-Id: Ie7aeefc63ba9e81f1027fb33b2b28678880d36ab