PcdFlashNvStorageFtwWorkingBase and PcdFlashNvStorageFtwSpareBase are
now updated each time an FVB instance is installed. This allows the
PCDs to be set at runtime at any time before the FVB is installed.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9312 6f19259b-4bc3-4df7-8a09-765794883524