x86: move ioapic code where it belongs

The commit 399287229c775a8962a852a761d65dc9475dec7c hacked the
ioapic resource mapping into apic.c for no good reason.
Move the code into io_apic_64.c where it belongs.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index a84a4ef..bcb5f3a 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -433,6 +433,7 @@
 	if (smp_found_config)
 		get_smp_config();
 	init_apic_mappings();
+	ioapic_init_mappings();
 
 	/*
 	 * We trust e820 completely. No explicit ROM probing in memory.