expat: Add license info

Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Luca Ceresoli <luca@lucaceresoli.net>

package/expat/expat.mk

@@ -10,6 +10,8 @@ EXPAT_INSTALL_STAGING = YES
 EXPAT_INSTALL_STAGING_OPT = DESTDIR=$(STAGING_DIR) installlib
 EXPAT_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) installlib
 EXPAT_DEPENDENCIES = host-pkg-config
+EXPAT_LICENSE = MIT
+EXPAT_LICENSE_FILES = COPYING
 
 $(eval $(autotools-package))
 $(eval $(host-autotools-package))