meson library and dependency cleanup

Change-Id: I09e3c514dfc67b701bf09a6e079ad3a5d9344fca
Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
diff --git a/meson.build b/meson.build
index 891b3b5..9ddfa45 100644
--- a/meson.build
+++ b/meson.build
@@ -12,6 +12,9 @@
 # not, default to the subproject.
 libhei_dep = dependency('hei', fallback : ['libhei', 'libhei_dep'])
 
+sdbusplus_dep       = dependency('sdbusplus', version : '>=1.0')
+dbus_interfaces_dep = dependency('phosphor-dbus-interfaces')
+
 incdir = include_directories('.')
 
 # See if phosphor-logging is available, if not use test case logging code. This