tg3: Revert RSS indir tbl setup change

This patch reverts commit 2601d8a0.  A
spectacular set of coincidences made it look as though the table was
setup incorrectly.  The original version was correct.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>