Move agl-service-hvac hvac.json configuration file install into its
own recipe so that just it will be machine-specific, and replace
m3ulcb-specific agl-service-hvac bbappend with a more generic
do_install_append_ulcb in the new agl-service-hvac-conf recipe.
Bug-AGL: SPEC-2949
Change-Id: Iabdfa2c204017a30bf82bed3eb6debbd3eb0be9c Signed-off-by: Scott Murray <scott.murray@konsulko.com>