regs: Get JSON configuration data filename from dbus

Retrieve the JSON configuration data filename from the service on dbus
hosting the predefined path, interface and system identifier property.
The system identifier property's value is used as the direct JSON
configuration data filename with the `.json` extension added.

Tested:
    A string representing the filename is retrieved from dbus

Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
Change-Id: Ib9a5227439045cd027125e9dd3ead377be19acba
diff --git a/phosphor-regulators/src/meson.build b/phosphor-regulators/src/meson.build
index 9d82033..ef4bec8 100644
--- a/phosphor-regulators/src/meson.build
+++ b/phosphor-regulators/src/meson.build
@@ -1,5 +1,6 @@
 phosphor_regulators_include_directories = include_directories(
     '.',
+    '../..',
     'actions'
 )
 
@@ -46,7 +47,10 @@
         sdeventplus,
         stdplus
     ],
-    link_with: phosphor_regulators_library,
+    link_with: [
+        phosphor_regulators_library,
+        libpower
+    ],
     implicit_include_directories: false,
     include_directories: phosphor_regulators_include_directories,
     install: true