Enable optional SHA1 hmac cookie generation

configname: CONFIG_SCTP_COOKIE_HMAC_SHA1

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The SCTP Protocol
└─>Enable optional SHA1 hmac cookie generation
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Enable optional SHA1 hmac based SCTP cookie generation