agl-service-voice-high: remove submodule usage

agl-service-voice-high: remove submodule usage

Update agl-service-voice-high recipe to replace git submodule usage
with DEPENDS on libafb-helpers and libappcontroller.  nlohmann-json
has been added also been added as a dependency since the json.hpp it
provides is no longer available from libafb-helpers as it previously
was from the submodule.  Finally, the lua dependencies have been
removed since nothing in the binding's controller usage requires
them.

Bug-AGL: SPEC-2854, SPEC-2856

Change-Id: I4ff980e6706c9e57da2c30181261f33c602f1515
Signed-off-by: Scott Murray <scott.murray@konsulko.com>