DOCSIS SEC v3.1 BPI cipher added

- SSE implementation of AES CFB 128 added to support partial DOCSIS blocks.
  AVX implementaion of the function will be added shortly to address potential
  performance degradation when mixing SSE with AVX code.
- DOCSIS cipher option added and implemented via existing AES CBC 128
  multi buffer implementations and new AES CFB 128 code.

Change-Id: I6e9c4e1d25af38d09fef75b55b9367af065ad3d1