[PATCH] mv643xx_eth: Remove BIT0-BIT31 #defines

Now that the BIT0-BIT31 defines are no longer used by mv643xx_eth.c,
remove them from mv643xx_eth.h.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>