x86, microcode support: fix build error

fix:

  arch/x86/kernel/microcode.c:412: error: static declaration of ‘microcode_init’ follows non-static declaration
  include/asm/microcode.h:1: error: previous declaration of ‘microcode_init’ was here
  arch/x86/kernel/microcode.c:454: error: static declaration of ‘microcode_exit’ follows non-static declaration
  include/asm/microcode.h:2: error: previous declaration of ‘microcode_exit’ was here
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/microcode.c

@@ -415,7 +415,7 @@ static struct notifier_block __refdata mc_cpu_notifier = {
 	.notifier_call = mc_cpu_callback,
 };
 
-static int microcode_init(void *opaque, struct module *module)
+int microcode_init(void *opaque, struct module *module)
 {
 	struct microcode_ops *ops = (struct microcode_ops *)opaque;
 	int error;
@@ -457,7 +457,7 @@ static int microcode_init(void *opaque, struct module *module)
 }
 EXPORT_SYMBOL_GPL(microcode_init);
 
-static void __exit microcode_exit (void)
+void __exit microcode_exit (void)
 {
 	microcode_dev_exit();