default.xml: meta-linaro switch to jethro branch as well
default.xml: meta-linaro switch to jethro branch as well

Signed-off-by: Koen Kooi <d0a161424d033e19799f22c7b0d92266ac3a2161@linaro.org>

linaro-home/lhg-oe-manifests,ndechesne/qcom-oe-manifest,96boards/oe-rpb-manifest