big-update: add LIC_FILES_CHKSUM
* fixes:
ERROR: big-update-2.0-r0 do_populate_lic: QA Issue: big-update: Recipe file fetches files and does not have license file information (LIC_FILES_CHKSUM) [license-checksum]
DESCRIPTION = "Example Package with 12MB of random, seeded content"
LICENSE = "MPL-2.0"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MPL-2.0;md5=815ca599c9df247a0c7f619bab123dad"
SRC_URI = "file://rand_file.py"
