Add IPV6 support from UNDI
    
    Add new information block ‘IPV6 support from UNDI’ in AIP protocol and provide sample implementation in UNDI driver.
    Update PXE driver to get ‘Ipv6Available’ of PXE BC Mode data from UNDI driver, if unsupported then not to start PXE over IPv6 path. 
    
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Ye Ting <ting.ye@intel.com>
    Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
    Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com>
    
    git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17275 6f19259b-4bc3-4df7-8a09-765794883524