STA and AP modes

Including the spisvc module in the SDEF makes it easier to get started
with the spiService.

by leaving op mode to STA and updating upmode just before setting
AP SSID.

  - reduced delay check of interrupt
  - fixed order issue in driver Tx
  - removed status register checks in SPI queue read/write

There is now a mangoh_red and a mangoh_green module.  The universal
mangoh module did very little in terms of code sharing so it made
sense to split it into two simpler modules.

The goal was to remove explicit paths where possible.  In the case of
the submodules, this helps to make them more useful as a standalone
repository in case a use isn't interested in cloning the whole mangOH
repository and all of the submodules.

Also updated the developerDay2016 tutorial app to use AVC 2.0 so that
it will work with Legato versions 17.05 and newer.

Remove the commented out gpio initialization code because it doesn't
seem like the gpio interface of the wp85 kernel will change in the
short term and thus the gpio kernel driver isn't useful.

Update comments in Makefile to support Developer Studio