x86, mce: trivial clean up for therm_throt.c

This patch removes following checkpatch warning:

WARNING: Use #include <linux/cpu.h> instead of <asm/cpu.h>
+#include <asm/cpu.h>
Signed-off-by: NHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

arch/x86/kernel/cpu/mcheck/therm_throt.c

@@ -20,7 +20,6 @@
 #include <linux/cpu.h>
 
 #include <asm/therm_throt.h>
-#include <asm/cpu.h>
 
 /* How long to wait between reporting thermal events */
 #define CHECK_INTERVAL		(300 * HZ)