arm: get rid of bi_env
bi_env is nowhere used, so delete it! Signed-off-by: NHeiko Schocher <hs@denx.de> similar patch posted from Dirk Behme Tue Jul 27 18:36:09 CEST 2010 http://lists.denx.de/pipermail/u-boot/2010-July/074542.html
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