ARC: remove @init_time, @init_irq platform callbacks

These are not in use for ARC platforms. Moreover DT mechanims exist to
probe them w/o explicit platform calls.

 - clocksource drivers can use CLOCKSOURCE_OF_DECLARE()
 - intc IRQCHIP_DECLARE() calls + cascading inside DT allows external
   intc to be probed automatically

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/include/asm/mach_desc.h

@@ -23,11 +23,8 @@
  * @dt_compat:		Array of device tree 'compatible' strings
  * 			(XXX: although only 1st entry is looked at)
  * @init_early:		Very early callback [called from setup_arch()]
- * @init_irq:		setup external IRQ controllers [called from init_IRQ()]
  * @init_smp:		for each CPU (e.g. setup IPI)
  * 			[(M):init_IRQ(), (o):start_kernel_secondary()]
- * @init_time:		platform specific clocksource/clockevent registration
- * 			[called from time_init()]
  * @init_machine:	arch initcall level callback (e.g. populate static
  * 			platform devices or parse Devicetree)
  * @init_late:		Late initcall level callback
@@ -36,13 +33,10 @@
 struct machine_desc {
 	const char		*name;
 	const char		**dt_compat;
-
 	void			(*init_early)(void);
-	void			(*init_irq)(void);
 #ifdef CONFIG_SMP
 	void			(*init_smp)(unsigned int);
 #endif
-	void			(*init_time)(void);
 	void			(*init_machine)(void);
 	void			(*init_late)(void);
 

arch/arc/kernel/irq.c

@@ -19,11 +19,11 @@
  */
 void __init init_IRQ(void)
 {
-	/* Any external intc can be setup here */
-	if (machine_desc->init_irq)
-		machine_desc->init_irq();
-
-	/* process the entire interrupt tree in one go */
+	/*
+	 * process the entire interrupt tree in one go
+	 * Any external intc will be setup provided DT chains them
+	 * properly
+	 */
 	irqchip_init();
 
 #ifdef CONFIG_SMP

arch/arc/kernel/time.c

@@ -285,7 +285,4 @@ void __init time_init(void)
 
 	/* sets up the periodic event timer */
 	arc_local_timer_setup();
-
-	if (machine_desc->init_time)
-		machine_desc->init_time();
 }