Create a new REMOVE_UNLICENSED variable and do_install() logic to
allow for marking certain firmware files as something to remove and not
package up.
This comes from the fact that the WHENCE file has a number of firmware
entries that have no license information or very questionable
declarations as to what the license is for the firmware.
Signed-off-by: Ryan Eatmon <reatmon@ti.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>