perfcounters fix section mismatch warning in perf_counter.c::perf_counters_lapic_init()

Fix:

WARNING: arch/x86/kernel/built-in.o(.text+0xdd0f): Section mismatch in reference from the function pmc_generic_enable() to the function .cpuinit.text:perf_counters_lapic_init()
The function pmc_generic_enable() references
the function __cpuinit perf_counters_lapic_init().
This is often because pmc_generic_enable lacks a __cpuinit
annotation or the annotation of perf_counters_lapic_init is wrong.
Signed-off-by: NMike Galbraith <efault@gmx.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/perf_counter.c

@@ -605,7 +605,7 @@ void perf_counter_notify(struct pt_regs *regs)
 	local_irq_restore(flags);
 }
 
-void __cpuinit perf_counters_lapic_init(int nmi)
+void perf_counters_lapic_init(int nmi)
 {
 	u32 apic_val;