[PATCH] ia64: remove MCA (MicroChannel) cruft

MCA_bus is now referenced only when CONFIG_MCA is set,
so we should be able to remove the definition from ia64.

include/asm-ia64/processor.h

@@ -53,12 +53,6 @@
  */
 #define TASK_UNMAPPED_BASE	(current->thread.map_base)
 
-/*
- * Bus types
- */
-#define MCA_bus 0
-#define MCA_bus__is_a_macro /* for versions in ksyms.c */
-
 #define IA64_THREAD_FPH_VALID	(__IA64_UL(1) << 0)	/* floating-point high state valid? */
 #define IA64_THREAD_DBG_VALID	(__IA64_UL(1) << 1)	/* debug registers valid? */
 #define IA64_THREAD_PM_VALID	(__IA64_UL(1) << 2)	/* performance registers valid? */