i386: Minor changes to allow clean creation of new board

This patch set makes some minor i386 specific changes required to create a new board. The changes resolve an issue with compiling 82559_eeprom.c and separating out PCI definitions.

A patch for the 82559 problem has been previously submitted but not applied due to concerns with whether it would impact on other builds. Unless I am mistaken, this file is only built for the i386 platform anyway, so there should not be an issue.

The acceptance of this patch set will allow some more significant improvements to the structure (and general cleanliness) of the i386 code

Regards,

Graeme