x64, x2apic/intr-remap: introduce read_apic_id() to genapic routines

Move the read_apic_id()  to genapic routines.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/genapic_64.h b/include/asm-x86/genapic_64.h
index 647e4e5..d567abc 100644
--- a/include/asm-x86/genapic_64.h
+++ b/include/asm-x86/genapic_64.h
@@ -27,6 +27,7 @@
 	/* */
 	unsigned int (*cpu_mask_to_apicid)(cpumask_t cpumask);
 	unsigned int (*phys_pkg_id)(int index_msb);
+	unsigned int (*read_apic_id)(void);
 };
 
 extern struct genapic *genapic;