Intel e7505: build as separate object file

No longer include northbridge files directly in the source for
mainboard romstage.c and fix includes.

Also make required adjustments to function declarations.

Change-Id: Iafdcc0766ed44c64cc628e5935eef2c6372f5f22
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/906
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
6 files changed