Blackfin: tweak objects specified before embedded environment

The partial linking patch changes how objects are specified to the linker
and breaks boards with an embedded environment.  So we need to tweak the
list of objects we specify via the linker script that go in the gap before
the embedded env to work with this new behavior.  This fixes linker errors
for all the boards in question.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>