Depend on libdbus-1-dev to enable systemd-login support.

Change-Id: I91f347bf9fb751a0c8c90c8f3e692456282b7800
diff --git a/debian/control b/debian/control
index 73e76a2..0939d86 100644
--- a/debian/control
+++ b/debian/control
@@ -33,6 +33,7 @@
  libvpx-dev,
  libsystemd-dev,
  libinput-dev (>= 0.8.0),
+ libdbus-1-dev,
  libdrm-imx-dev (>= 2.4.84+imx),
  wayland-protocols (>= 1.8),
 Standards-Version: 4.1.1