recipes: Update LICENSE variable to use SPDX license identifiers

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

meta-oe/dynamic-layers/meta-python/recipes-bsp/rwmem/rwmem_1.2.bb

@@ -8,7 +8,7 @@ can thus be used to access devices which have memory mapped registers. \
 \
 In i2c mode rwmem accesses an i2c peripheral by sending i2c messages to it."
 
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 
 DEPENDS += "python3 python3-pybind11"

meta-oe/dynamic-layers/meta-python/recipes-connectivity/lirc/lirc_0.10.1.bb

@@ -5,7 +5,7 @@ DESCRIPTION:append:lirc-remotes = " This package contains some config files for
 DESCRIPTION:append:lirc-nslu2example = " This package contains a working config for RC5 remotes and a modified NSLU2."
 HOMEPAGE = "http://www.lirc.org"
 SECTION = "console/network"
-LICENSE = "GPLv2"
+LICENSE = "GPL-2.0-only"
 DEPENDS = "libxslt-native alsa-lib libftdi libusb1 libusb-compat jack portaudio-v19 python3-pyyaml python3-setuptools-native"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"

meta-oe/dynamic-layers/meta-python/recipes-extended/lcdproc/lcdproc_git.bb

@@ -3,7 +3,7 @@ shipped with this package can be used to acquire various kinds of system stats."
 SUMMARY = "Drivers for character-based LCD displays"
 HOMEPAGE = "http://lcdproc.org"
 SECTION = "utils"
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 DEPENDS = "ncurses lirc"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=18810669f13b87348459e611d31ab760 \

meta-oe/dynamic-layers/meta-python/recipes-support/smem/smem_1.5.bb

@@ -6,7 +6,7 @@ libraries and applications in a virtual memory system."
 HOMEPAGE = "http://www.selenic.com/smem/"
 SECTION = "Applications/System"
 
-LICENSE = "GPLv2+"
+LICENSE = "GPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 
 HG_CHANGESET = "98273ce331bb"