build: use phosphor-dbus-interfaces directly

Change-Id: I03c12767b554cfd90760dc17f1ce159cd2b8a962
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/configure.ac b/configure.ac
index e976bff..e439154 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,6 +12,8 @@
 
 # Check for libraries
 PKG_CHECK_MODULES([SYSTEMD], [libsystemd >= 221])
+PKG_CHECK_MODULES([PHOSPHOR_DBUS_INTERFACES], [phosphor-dbus-interfaces],,\
+    AC_MSG_ERROR(["Requires phosphor-dbus-interfaces package."]))
 
 # Checks for typedefs, structures, and compiler characteristics.
 AX_CXX_COMPILE_STDCXX_14([noext])