layers.txt: Use webOS-ports/danny branches

* we're depending on danny branches for other layers for some time
  so we should indicate it properly also in our layers

* meta-webos/webOS-ports/danny
  and
  meta-webos-ports/webOS-ports/danny
  will be merged to
  meta-webos-ports/danny

* meta-webos/jansa/master-oe-core
  and
  meta-webos-ports/jansa/master-oe-core
  will be merged to
  meta-webos-ports/master
  and stay compatible with master branches in other layers

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>