sctp: fix error cause codes of ADD-IP extension

RFC5061 had changed the error cause codes for Dynamic Address
Reconfiguration As the following:

       Cause Code
       Value          Cause Code
       ---------      ----------------
       0x00A0          Request to Delete Last Remaining IP Address
       0x00A1          Operation Refused Due to Resource Shortage
       0x00A2          Request to Delete Source IP Address
       0x00A3          Association Aborted Due to Illegal ASCONF-ACK
       0x00A4          Request Refused - No Authorization

This patch fix the error cause codes.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>