"BSD" is ambiguous, use the precise license BSD-3-Clause.
Note that the actual license text is BSD 4-Clause with clause 3 rescinded:
https://gitlab.freedesktop.org/xorg/lib/libxfont/-/blob/master/COPYING#L157
(From OE-Core rev: 1649e9d281938a9183c5620612ed7a24a9b9f1e2)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>