setup-environment-internal: remove unexpected line from site.conf
setup-environment-internal: remove unexpected line from site.conf

site.conf should not set BBFILES, it is probably a left over from an older
version of this script.

Change-Id: I4b5bb932ce29d96ec062f41e9574d98d3d6d2510
Signed-off-by: Nicolas Dechesne <05fca36dfcf68f7e1c9eaf62b074676ab50a133b@linaro.org>

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