Register the cache on the main D-Bus connection
Register the cache on the main D-Bus connection

In atk_bridge_adaptor_cleanup, droute will deregister the cache object
path from the main DBusConnection, causing libdbus to complain since it
was not registered. Fixes a regression introduced when deferring
registration of the cache.

GNOME/at-spi2-core,Distrotech/at-spi2-atk,GNOME/at-spi2-core,GNOME/at-spi2-atk,GNOME/at-spi2-core,Distrotech/at-spi2-atk