bnx2x: remove dead code and make local funcs static

Sparse warned about several functions that were unnecessarily global.
After making them static, discovered that several functions were actually never used.

Compile tested only.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Eilon Greenstein <eilong@broadcomo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>