x86, apic: clean up ->setup_apic_routing()

- separate the namespace

 - remove macros

 - remove namespace clash on 64-bit

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index b707793..fcbcc03 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -1625,7 +1625,7 @@
 	enable_IR_x2apic();
 #endif
 #ifdef CONFIG_X86_64
-	setup_apic_routing();
+	default_setup_apic_routing();
 #endif
 
 	verify_local_APIC();