x86: Move irq_init to x86_init_ops

irq_init is overridden by x86_quirks and by paravirts. Unify the whole
mess and make it an unconditional x86_init_ops function which defaults
to the standard function and can be overridden by the early platform
code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 65e3394..8d7be65 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -47,9 +47,11 @@
  * struct x86_init_irqs - platform specific interrupt setup
  * @pre_vector_init:		init code to run before interrupt vectors
  *				are set up.
+ * @intr_init:			interrupt init code
  */
 struct x86_init_irqs {
 	void (*pre_vector_init)(void);
+	void (*intr_init)(void);
 };
 
 /**