Implement RC Setter for ReturnCode
Implement RC Setter for ReturnCode

In order to propagate the multicast compare errors correctly
(with the correct FAPI RC and Hostboot errl), we need a way
for ReturnCode class to be able to reset the internal RC
to somehting other than the default RC without using constructors/
converters. This will allow to maintain a valid plat error log pointer
and have a custom FAPI RC packaged into the ReturnCode structure.

Change-Id: I842cdb2da015a570f3d43cc4e951efe253851823
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/87472
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Tested-by: PPE CI <dc75934ba5befb9221434e67a247b93aec46b36b@us.ibm.com>
Tested-by: Hostboot CI <52521565bd8ea18a2b112942dce4f4220a97c2c8@us.ibm.com>
Reviewed-by: Nicholas E Bofferding <fb8db48116bc8a69e29dd8cdb037246f232f4af5@us.ibm.com>
Reviewed-by: Daniel M Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>
Reviewed-by: Matt K Light <19ba8ed73a0b3c376c81fced381f1ac0f483b7c2@us.ibm.com>
Reviewed-by: Jennifer A Stofer <ab93eca12e43608f33daa16a67357cd7b7e867ab@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/87660
Tested-by: Jenkins OP Build CI <e610bd72261d3c0a48f1e8ae36832ab00774d426@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot