Adopt SPDX identifiers for license fields

.SRCINFO

@@ -4,7 +4,7 @@ pkgbase = tuned
 	pkgrel = 2
 	url = https://github.com/redhat-performance/tuned
 	arch = any
-	license = GPL
+	license = GPL-2.0-or-later
 	makedepends = desktop-file-utils
 	depends = dbus-glib
 	depends = ethtool

PKGBUILD

@@ -10,7 +10,7 @@ pkgrel=2
 pkgdesc='Daemon that performs monitoring and adaptive configuration of devices in the system'
 arch=('any')
 url="https://github.com/redhat-performance/${pkgbase}"
-license=('GPL')
+license=('GPL-2.0-or-later')
 depends=('dbus-glib' 'ethtool' 'gawk' 'hdparm' 'polkit' 'python-configobj' 'python-dbus' 'python-gobject' 'python-linux-procfs' 'python-perf' 'python-pyudev')
 makedepends=('desktop-file-utils')
 source=("https://github.com/redhat-performance/${pkgbase}/archive/v${pkgver}/${pkgbase}-${pkgver}.tar.gz")