linux-dummy: add license and LIC_FILES_CHKSUM

This package fails to build because of missing LIC_FILES_CHKSUM option.
This patch adds GPL and LIC_FILES_CHKSUM to this recipe.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

meta/recipes-kernel/linux/linux-dummy.bb

@@ -2,6 +2,8 @@ SECTION = "kernel"
 DESCRIPTION = "Dummy Linux kernel"
 LICENSE = "GPL"
 
+LIC_FILES_CHKSUM = "file://${WORKDIR}/COPYING.GPL;md5=751419260aa954499f7abaabaa882bbe"
+
 PROVIDES += "virtual/kernel"
 
 PACKAGES_DYNAMIC += "kernel-module-*"
@@ -11,7 +13,8 @@ PACKAGES_DYNAMIC += "kernel-image-*"
 
 PR = "r1"
 
-SRC_URI = ""
+SRC_URI = "file://COPYING.GPL"
+S = "${WORKDIR}"
 
 do_configure() {
         :