All accesses to control launching applications are now done
via agl-service-homescreen/libhomescreen, and thus the unused
DBus interface can be removed.
Bug-AGL: SPEC-3137
Change-Id: I27f5afd89bd15eb50486e2546a730e40f016b05e Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>