src_distribute.bbclass: distribute only SRC_DISTRIBUTE_LICENSES
src_distribute.bbclass: distribute only SRC_DISTRIBUTE_LICENSES

A distro can require conf/licenses.conf or set SRC_DISTRIBUTE_LICENSES
selecting which licenses are wanted to be distributed. In case it is
empty or undefined we default to distribute all licenses to not break
backward compatibility.

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>
Signed-off-by: Tom Rini <4c3d5c8f8c21c27dd329bd585f481113514551fd@mentor.com>

rascalmicro/openembedded-rascal,rascalmicro/openembedded-rascal,rascalmicro/openembedded-rascal,rascalmicro/openembedded-rascal,rascalmicro/openembedded-rascal,rascalmicro/openembedded-rascal,rascalmicro/openembedded-rascal,rascalmicro/openembedded-rascal