layer: Update LICENSE variable to use SPDX license identifiers

converted with oe-core/scripts/contrib/convert-spdx-licenses.py script

Signed-off-by: Pierre-Jean Texier <texier.pj2@gmail.com>
Signed-off-by: Stefano Babic <sbabic@denx.de>

recipes-extended/images/swupdate-gui-image.bb

@@ -1,7 +1,7 @@
 SUMMARY = "Root filesystem for swupdate as rescue system including GUI"
 DESCRIPTION = "Root FS to start swupdate in rescue mode	\
 		"
-LICENSE = "GPLv2"
+LICENSE = "GPL-2.0-only"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/GPL-2.0;md5=801f80980d171dd6425610833a22dbe6"
 
 require swupdate-image.inc

recipes-support/rescuegui/rescuegui_git.bb

@@ -2,7 +2,7 @@ SUMMARY="Simple GUI for SWUpdate in rescue mode"
 DESCRIPTION = "This is a simple GUI that allows to set network addresses \
 	and start an install from local media. It shows progress on the HMI"
 SECTION="swupdate"
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/GPL-2.0-or-later;md5=fed54355545ffd980b814dab4a3b312c"
 
 inherit update-rc.d

recipes-support/swupdate/swupdate.inc

@@ -6,8 +6,8 @@ DEPENDS += "libconfig zlib"
 # SWUpdate licensing is described in the following pages:
 # https://sbabic.github.io/swupdate/licensing.html
 # rst form: file://doc/source/licensing.rst
-LICENSE = "GPLv2+ & LGPLv2+ & MIT"
-LICENSE:${PN}-lua = "LGPLv2+"
+LICENSE = "GPL-2.0-or-later & LGPL-2.1-only & MIT"
+LICENSE:${PN}-lua = "LGPL-2.1-only"
 LICENSE:${PN}-www = "MIT"
 
 LIC_FILES_CHKSUM = "file://LICENSES/GPL-2.0-only.txt;md5=4ee23c52855c222cba72583d301d2338 \