FM: Add property to force use internal antenna

Allow devices to force the FM radio to use the internal antenna setup by
setting hw.fm.internal_antenna property to true in system.prop.

Device tree example here: I7c9a67371c775a343345b035c196152bd9b2e13d

Change-Id: I1a055070bb4b7e49b7a03c75632d4b95c59f02da

Author: Dhruv Paranjape <lord.dhruv@gmail.com>
Date:   Thu May 14 20:49:26 2015 +0800
FM: respect hw.fm.internal_antenna

PS2: Patch from here: http://forum.xda-developers.com/showpost.php?p=60580714&postcount=86

Change-Id: Ic3104de252bac108c925e7cd5f50d9e89ca63779
2 files changed
tree: 2e56a7f6955a80be1be49dabd47f5bc406513b6b
  1. fm_hci/
  2. fmapp2/
  3. helium/
  4. jni/
  5. qcom/
  6. .gitupstream