recipes: Update LICENSE variable to use SPDX license identifiers

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-support/drbd/drbd-utils_9.13.1.bb

@@ -5,7 +5,7 @@ Think of it as networked raid 1. It is a building block for\
 setting up high availability (HA) clusters."
 HOMEPAGE = "http://www.drbd.org/"
 SECTION = "admin"
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://COPYING;md5=5574c6965ae5f583e55880e397fbb018"
 
 SRC_URI = "git://github.com/LINBIT/drbd-utils;name=drbd-utils;branch=${PV};protocol=https \

meta-networking/recipes-support/drbd/drbd_9.0.24-1.bb

@@ -4,7 +4,7 @@ DESCRIPTION = "DRBD is a block device which is designed to build high \
                block device via (a dedicated) network. You could see \
                it as a network raid-1."
 HOMEPAGE = "http://oss.linbit.com/drbd/"
-LICENSE = "GPLv2"
+LICENSE = "GPL-2.0-only"
 LIC_FILES_CHKSUM = "file://COPYING;md5=5574c6965ae5f583e55880e397fbb018"
 DEPENDS = "virtual/kernel"