sudo: Use specific BSD license variant

Make the license more accurate by specifying the specific variant of BSD
license instead of the generic one. This helps with SPDX license
attribution as "BSD" is not a valid SPDX license.

(From OE-Core rev: ff27ea21)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b1596d37ba13db3aff61975a31d865f33333fa45)
Signed-off-by: Nikhil R <nikhil.r@kpit.com>
Signed-off-by: Omkar Patil <omkarpatil10.93@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>