x86: merge tsc_init and clocksource code

Unify the clocksource code.
Unify the tsc_init code.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Signed-off-by: Dan Hecht <dhecht@vmware.com>
Cc: Dan Hecht <dhecht@vmware.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/time.h b/include/asm-x86/time.h
index bce72d7..a17fa47 100644
--- a/include/asm-x86/time.h
+++ b/include/asm-x86/time.h
@@ -56,4 +56,6 @@
 
 #endif /* CONFIG_PARAVIRT */
 
+extern unsigned long __init calibrate_cpu(void);
+
 #endif