x86, apic: clean up target_cpus methods

Impact: cleanup

Clean up all the target_cpus() namespace overlap that exists
between bigsmp, es7000, mach-default, numaq and summit - by
separating the different functions into different names.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/include/asm/bigsmp/apic.h b/arch/x86/include/asm/bigsmp/apic.h
index dca2d5b..d6aeca3 100644
--- a/arch/x86/include/asm/bigsmp/apic.h
+++ b/arch/x86/include/asm/bigsmp/apic.h
@@ -9,7 +9,7 @@
 	return 1;
 }
 
-static inline const cpumask_t *target_cpus(void)
+static inline const cpumask_t *bigsmp_target_cpus(void)
 {
 #ifdef CONFIG_SMP
 	return &cpu_online_map;