doc: remove unnecessary API code from security guide
doc: remove unnecessary API code from security guide

Various xform structures are being copied in
rte_security guide which can be referred from the
API documentation generated by Doxygen. The security guide
does not talk about specific details of these xforms and
thus are removed from the security guide.

Signed-off-by: Akhil Goyal <74d7c4c993a22c1d4f60c46ff3d95c969a24a25c@nxp.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk