treewide: fix GPLv2+ obsolete-license warnings

The LICENSE string 'GPLv2+' is considered obsolete by Yocto and raises a
warning.  Switch them too the accepted tag 'GPL-2.0-or-later'.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I88c639dbb45762e2e019a3503f1f1930b65c09d6
diff --git a/meta-phosphor/dynamic-layers/aspeed-layer/recipes-kernel/cf-fsi-firmware/cf-fsi-firmware_git.bb b/meta-phosphor/dynamic-layers/aspeed-layer/recipes-kernel/cf-fsi-firmware/cf-fsi-firmware_git.bb
index 33d930c..f199e10 100644
--- a/meta-phosphor/dynamic-layers/aspeed-layer/recipes-kernel/cf-fsi-firmware/cf-fsi-firmware_git.bb
+++ b/meta-phosphor/dynamic-layers/aspeed-layer/recipes-kernel/cf-fsi-firmware/cf-fsi-firmware_git.bb
@@ -1,7 +1,7 @@
 SUMMARY = "Firmware for using the ASPEED ColdFire FSI master"
 SECTION = "kernel"
 
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 
 SRCREV = "bae32e353a3641b5164211f6bf06c5620f6e384d"
diff --git a/meta-phosphor/recipes-phosphor/video/fbterm_git.bb b/meta-phosphor/recipes-phosphor/video/fbterm_git.bb
index 662c9cc..568bbc6 100644
--- a/meta-phosphor/recipes-phosphor/video/fbterm_git.bb
+++ b/meta-phosphor/recipes-phosphor/video/fbterm_git.bb
@@ -1,5 +1,5 @@
 HOMEPAGE = "https://github.com/jk-ozlabs/fbterm"
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 
 SRC_URI += "git://github.com/jk-ozlabs/fbterm.git;nobranch=1;protocol=https"
 SRC_URI += "file://fb.modes"
diff --git a/meta-phosphor/recipes-phosphor/video/uart-render-controller_git.bb b/meta-phosphor/recipes-phosphor/video/uart-render-controller_git.bb
index 3b53b8d..387be0f 100644
--- a/meta-phosphor/recipes-phosphor/video/uart-render-controller_git.bb
+++ b/meta-phosphor/recipes-phosphor/video/uart-render-controller_git.bb
@@ -1,5 +1,5 @@
 HOMEPAGE = "https://github.com/jk-ozlabs/uart-render-controller"
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 
 SRC_URI += "git://github.com/jk-ozlabs/uart-render-controller;branch=master;protocol=https"
 SRC_URI += "file://uart-render-controller.service"