Remove AMD special case for LAPIC based udelay()

- Optionally override FSB clock detection in generic
  LAPIC code with constant value.
- Override on AMD Model fxx, 10xxx, agesa CPUs with 200MHz
- compile LAPIC code for romstage, too
- Remove #include ".../apic_timer.c" in AMD based mainboards
- Remove custom udelay implementation from intel northbridges' romstages

Future work:
- remove the compile time special case
  (requires some cpuid based switching)
- drop northbridge udelay implementations (i945, i5000) if
  not required anymore (eg. can SMM use the LAPIC timer?)

Change-Id: I25bacaa2163f5e96ab7f3eaf1994ab6899eff054
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1618
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/ibm/e325/romstage.c

@@ -11,7 +11,6 @@
 #include "northbridge/amd/amdk8/incoherent_ht.c"
 #include "southbridge/amd/amd8111/early_smbus.c"
 #include "northbridge/amd/amdk8/raminit.h"
-#include "cpu/amd/model_fxx/apic_timer.c"
 #include "lib/delay.c"
 #include "northbridge/amd/amdk8/reset_test.c"
 #include "northbridge/amd/amdk8/debug.c"

src/mainboard/ibm/e326/romstage.c

@@ -11,7 +11,6 @@
 #include "northbridge/amd/amdk8/incoherent_ht.c"
 #include "southbridge/amd/amd8111/early_smbus.c"
 #include "northbridge/amd/amdk8/raminit.h"
-#include "cpu/amd/model_fxx/apic_timer.c"
 #include "lib/delay.c"
 #include "northbridge/amd/amdk8/reset_test.c"
 #include "northbridge/amd/amdk8/debug.c"