Segregate utility methods

This commit segregates utility methods required commonly by both
openpower-read-vpd and ibm-read-vpd from methods only required by
ibm-read-vpd.
All dependency required by utility methods specific to ibm-read-vpd
is not applicable to utility methods required by openpower-read-vpd.

Hence to avoid un-necessary dependency inclusion, this change is
introduced.

Signed-off-by: Sunny Srivastava <sunnsr25@in.ibm.com>
Change-Id: I95f2be27dc0c391a45beb1654a99506317aaa52b
diff --git a/impl.cpp b/impl.cpp
index d8a6138..a0a45d9 100644
--- a/impl.cpp
+++ b/impl.cpp
@@ -2,7 +2,7 @@
 
 #include "const.hpp"
 #include "defines.hpp"
-#include "utils.hpp"
+#include "ibm_vpd_utils.hpp"
 #include "vpd_exceptions.hpp"
 
 #include <algorithm>