x86: add cpu init function defintions to cpu.h

cpu.h was already included everywhere needed.

Fixes following sparse warnings:

arch/x86/kernel/cpu/amd.c:343:12: warning: symbol 'amd_init_cpu' was not declared. Should it be static?
arch/x86/kernel/cpu/cyrix.c:444:12: warning: symbol 'cyrix_init_cpu' was not declared. Should it be static?
arch/x86/kernel/cpu/cyrix.c:456:12: warning: symbol 'nsc_init_cpu' was not declared. Should it be static?
arch/x86/kernel/cpu/centaur.c:467:12: warning: symbol 'centaur_init_cpu' was not declared. Should it be static?
arch/x86/kernel/cpu/transmeta.c:112:12: warning: symbol 'transmeta_init_cpu' was not declared. Should it be static?
arch/x86/kernel/cpu/intel.c:296:12: warning: symbol 'intel_cpu_init' was not declared. Should it be static?
arch/x86/kernel/cpu/nexgen.c:56:12: warning: symbol 'nexgen_init_cpu' was not declared. Should it be static?
arch/x86/kernel/cpu/umc.c:22:12: warning: symbol 'umc_init_cpu' was not declared. Should it be static?
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/cpu/common.c

@@ -623,16 +623,6 @@ cpumask_t cpu_initialized __cpuinitdata = CPU_MASK_NONE;
  * They will insert themselves into the cpu_devs structure.
  * Then, when cpu_init() is called, we can just iterate over that array.
  */
-
-extern int intel_cpu_init(void);
-extern int cyrix_init_cpu(void);
-extern int nsc_init_cpu(void);
-extern int amd_init_cpu(void);
-extern int centaur_init_cpu(void);
-extern int transmeta_init_cpu(void);
-extern int nexgen_init_cpu(void);
-extern int umc_init_cpu(void);
-
 void __init early_cpu_init(void)
 {
 	intel_cpu_init();

arch/x86/kernel/cpu/cpu.h

@@ -27,3 +27,12 @@ extern void display_cacheinfo(struct cpuinfo_x86 *c);
 extern void early_init_intel(struct cpuinfo_x86 *c);
 extern void early_init_amd(struct cpuinfo_x86 *c);
 
+/* Specific CPU type init functions */
+int intel_cpu_init(void);
+int amd_init_cpu(void);
+int cyrix_init_cpu(void);
+int nsc_init_cpu(void);
+int centaur_init_cpu(void);
+int transmeta_init_cpu(void);
+int nexgen_init_cpu(void);
+int umc_init_cpu(void);