cpu/cpu.h: add ROMCC guards

In order to use the generic microcode update code in the bootblock, cpu/cpu.h
needs ROMCC guards. Also, delete the unused struct device declaration and move
the struct bus declaration to where it's used.

Change-Id: I0cc731c555593946e931a680ec93994932530599
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/932
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/include/cpu/cpu.h b/src/include/cpu/cpu.h
index cca2be1..c2113c1 100644
--- a/src/include/cpu/cpu.h
+++ b/src/include/cpu/cpu.h
@@ -1,11 +1,11 @@
 #ifndef CPU_CPU_H
 #define CPU_CPU_H
 
-struct device;
-struct bus;
 #include <arch/cpu.h>
 
+#if !defined(__ROMCC__)
 void cpu_initialize(void);
+struct bus;
 void initialize_cpus(struct bus *cpu_bus);
 void secondary_cpu_init(void);
 
@@ -26,5 +26,6 @@
 extern struct cpu_driver cpu_drivers[];
 /** end of compile time generated pci driver array */
 extern struct cpu_driver ecpu_drivers[];
+#endif /* !__ROMCC__ */
 
 #endif /* CPU_CPU_H */