load ixp42x NPE firmware from separate flash block, remove dead code

load ixp42x NPE firmware from separate flash block, remove dead code

Hi,

the following patch adds support to move the IXP42X NPE firmware to a
separate flash block, whose start address is defined in
CONFIG_IXP4XX_NPE_EXT_UCODE_BASE. Using that, it is possible to build
NPE-enabled u-boot without copyright problems due to the NPE firmware.

I hope the patch applies, I get whitespace-related differences in the NPE
files due to trailing whitespace in the original versions.

Signed-off-by: Michael Schwingen <michael@schwingen.org>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>