iperf3: Clarify BSD license variant

The License of iperf3 is BSD-3-Clause.

Signed-off-by: Christophe Priouzeau <christophe.priouzeau@st.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-benchmark/iperf3/iperf3_3.7.bb

@@ -8,7 +8,7 @@ HOMEPAGE = "http://software.es.net/iperf/"
 SECTION = "console/network"
 BUGTRACKER = "https://github.com/esnet/iperf/issues"
 AUTHOR = "ESNET <info@es.net>, Lawrence Berkeley National Laboratory <websupport@lbl.gov>"
-LICENSE = "BSD"
+LICENSE = "BSD-3-Clause"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=f9088fe7ffdccd042f7645f1012d7f70"
 
 DEPENDS = "openssl"