util-linux: improve license description

Use the recommended format for describing the license of different
components.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/util-linux/util-linux.mk

@@ -11,7 +11,7 @@ UTIL_LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/utils/util-linux/v$(UTIL_LINUX_VERS
 
 # README.licensing claims that some files are GPLv2-only, but this is not true.
 # Some files are GPLv3+ but only in tests.
-UTIL_LINUX_LICENSE = GPLv2+, BSD-4c, libblkid, libfdisk and libmount LGPLv2.1+, libuuid BSD-3c
+UTIL_LINUX_LICENSE = GPLv2+, BSD-4c, LGPLv2.1+ (libblkid, libfdisk, libmount), BSD-3c (libuuid)
 UTIL_LINUX_LICENSE_FILES = README.licensing Documentation/licenses/COPYING.GPLv2 Documentation/licenses/COPYING.UCB Documentation/licenses/COPYING.LGPLv2.1 Documentation/licenses/COPYING.BSD-3
 UTIL_LINUX_INSTALL_STAGING = YES
 UTIL_LINUX_DEPENDENCIES = host-pkgconf