Move cpus_ready_for_init() to AMD K8

The function is a noop for all but amd/serengeti_cheetah.

Change-Id: I09e2e710aa964c2f31e35fcea4f14856cc1e1dca
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/1184
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/northbridge/amd/amdk8/Kconfig

@@ -33,6 +33,10 @@ config K8_HT_FREQ_1G_SUPPORT
 	bool
 	default n
 
+config WAIT_BEFORE_CPUS_INIT
+	bool
+	default n
+
 config MEM_TRAIN_SEQ
 	int
 	default 0

src/northbridge/amd/amdk8/amdk8.h

@@ -14,4 +14,6 @@ void setup_resource_map_offset(const unsigned int *register_values, int max, uns
 void fill_mem_ctrl(int controllers, struct mem_controller *ctrl_a, const uint16_t *spd_addr);
 #endif
 
+void cpus_ready_for_init(void);
+
 #endif /* AMDK8_H */

src/northbridge/amd/amdk8/northbridge.c

@@ -1369,6 +1369,9 @@ static u32 cpu_bus_scan(device_t dev, u32 max)
 
 static void cpu_bus_init(device_t dev)
 {
+#if CONFIG_WAIT_BEFORE_CPUS_INIT
+	cpus_ready_for_init();
+#endif
 	initialize_cpus(dev->link_list);
 }