Use '${COMMON_LICENSE_DIR}/MIT' for MIT License to fix the warning:
| WARNING: packagegroup-xfce-base-1.0-r5 do_populate_lic:
${COREBASE}/LICENSE is not a valid license file, please use
'${COMMON_LICENSE_DIR}/MIT' for a MIT License file in LIC_FILES_CHKSUM.
This will become an error in the future
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
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