irq_domain: convert microblaze from irq_host to irq_domain

Trivial change, microblaze doesn't use irq remapping yet.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Thomas Gleixner <tglx@linutronix.de>

arch/microblaze/include/asm/irq.h

@@ -39,7 +39,7 @@ static inline void irq_dispose_mapping(unsigned int virq)
 	return;
 }
 
-struct irq_host;
+struct irq_domain;
 
 /**
  * irq_create_mapping - Map a hardware interrupt into linux virq space
@@ -51,7 +51,7 @@ struct irq_host;
  * If the sense/trigger is to be specified, set_irq_type() should be called
  * on the number returned from that call.
  */
-extern unsigned int irq_create_mapping(struct irq_host *host,
+extern unsigned int irq_create_mapping(struct irq_domain *host,
 					irq_hw_number_t hwirq);
 
 #endif /* _ASM_MICROBLAZE_IRQ_H */

arch/microblaze/kernel/irq.c

@@ -51,7 +51,7 @@ void __irq_entry do_IRQ(struct pt_regs *regs)
 
 /* MS: There is no any advance mapping mechanism. We are using simple 32bit
   intc without any cascades or any connection that's why mapping is 1:1 */
-unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq)
+unsigned int irq_create_mapping(struct irq_domain *host, irq_hw_number_t hwirq)
 {
 	return hwirq + IRQ_OFFSET;
 }

arch/microblaze/kernel/setup.c

@@ -51,8 +51,6 @@ void __init setup_arch(char **cmdline_p)
 
 	unflatten_device_tree();
 
-	/* NOTE I think that this function is not necessary to call */
-	/* irq_early_init(); */
 	setup_cpuinfo();
 
 	microblaze_cache_init();