tayga: change LICENSE identifier to new GPL-2.0-only

The old GPLv2 identifier has been deprecated in oe-core. Time to catch
up with this recipe.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

meta-oniro-staging/recipes-connectivity/tayga/tayga_0.9.2.bb

@@ -8,7 +8,7 @@ DESCRIPTION = "TAYGA is an out-of-kernel stateless NAT64 implementation for \
     kernel. It is intended to provide production-quality NAT64 service for \
     networks where dedicated NAT64 hardware would be overkill."
 SECTION = "net"
-LICENSE="GPLv2"
+LICENSE="GPL-2.0-only"
 LIC_FILES_CHKSUM="file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f"
 
 SRC_URI= "http://www.litech.org/tayga/tayga-0.9.2.tar.bz2 \