x86: move MWAIT idle check to generic CPU initialization on 32-bit

Previously it was only run for Intel CPUs, but AMD Fam10h implements MWAIT too.

This matches 64bit behaviour.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index ed05c7a..4bd326d 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -499,6 +499,8 @@
 
 	/* Init Machine Check Exception if available. */
 	mcheck_init(c);
+
+	select_idle_routine(c);
 }
 
 void __init identify_boot_cpu(void)