package/python-bluezero: select dbus

Build is broken since commit
8bdc5e7c because BR2_PACKAGE_DBUS_PYTHON
is selected without selecting BR2_PACKAGE_DBUS

Fixes:
 - http://autobuild.buildroot.org/results/378dd714940440b8f9db763479ae929e90e33b80



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>