Common file to hold all constant values

This commit introduces a const.hpp file to hold all the
constants related to the openpower vpd repository.
All new and ongoing implementations can make use of this
file to declare or reuse constants.

Signed-off-by: Sunny Srivastava <sunnsr25@in.ibm.com>
Change-Id: Ib93c1c264dc8c69198140d63318e7e132d33fb13
diff --git a/vpd-manager/manager.cpp b/vpd-manager/manager.cpp
index bd3af72..ce8bea5 100644
--- a/vpd-manager/manager.cpp
+++ b/vpd-manager/manager.cpp
@@ -2,6 +2,7 @@
 
 #include "manager.hpp"
 
+#include "const.hpp"
 #include "parser.hpp"
 
 #include <exception>
diff --git a/vpd-manager/meson.build b/vpd-manager/meson.build
index 0b655fd..7393379 100644
--- a/vpd-manager/meson.build
+++ b/vpd-manager/meson.build
@@ -25,7 +25,8 @@
                         'manager_main.cpp',
                         'manager.cpp',
                         'server.cpp',
-                        'error.cpp'
+                        'error.cpp',
+                        '../impl.cpp'
                         ]
 
 vpd_manager_exe = executable('vpd-manager',