[PATCH] security: remove get_userdata function pointer

[Akhil Goyal]

> > Subject: [PATCH] security: remove get_userdata function pointer
> >
> > Removes get_userdata function pointer as it is being unused
> > and make fast accessing method that uses dynamic field to get
> > userdata as default for optimizing security path.
> >
> > Signed-off-by: Srujana Challa <schalla at marvell.com>
> Applied to dpdk-next-crypto
> 
Release notes added for API changes introduced in this patch.
Updated patch title and description as well.