PCI subsystem: Remove AGP bridge type

There is no auto-detection for AGP type and we have no hardware that
selects this. Furthermore, we treat AGP bridges just like PCI bridges,
there is no optimisation for higher bandwidth.

Change-Id: I4fe87c83411643cb9b8d3216f2af07bf098174d3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/8367
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/include/device/agp.h

@@ -1,14 +0,0 @@
-/* (c) 2005 Linux Networx GPL see COPYING for details */
-
-#ifndef DEVICE_AGP_H
-#define DEVICE_AGP_H
-
-#include <device/device.h>
-
-unsigned int agp_scan_bus(struct bus *bus,
-	unsigned min_devfn, unsigned max_devfn, unsigned int max);
-unsigned int agp_scan_bridge(device_t dev, unsigned int max);
-
-extern struct device_operations default_agp_ops_bus;
-
-#endif /* DEVICE_AGP_H */