Add UPower Device interface

Add a YAML description of the UPower Device interface defined at
https://upower.freedesktop.org/docs/Device.html

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Ib70d6525b913cf06da4e93a53e332487126f1db0
diff --git a/meson.build b/meson.build
index 7b2ad92..be863f2 100644
--- a/meson.build
+++ b/meson.build
@@ -29,6 +29,9 @@
 if get_option('data_com_ibm')
     selected_subdirs += 'com/ibm'
 endif
+if get_option('data_org_freedesktop')
+    selected_subdirs += 'org/freedesktop'
+endif
 if get_option('data_org_open_power')
     selected_subdirs += 'org/open_power'
 endif