ARM: delete struct sys_timer

Now that the only field in struct sys_timer is .init, delete the struct,
and replace the machine descriptor .timer field with the initialization
function itself.

This will enable moving timer drivers into drivers/clocksource without
having to place a public prototype of each struct sys_timer object into
include/linux; the intent is to create a single of_clocksource_init()
function that determines which timer driver to initialize by scanning
the device dtree, much like the proposed irqchip_init() at:
http://www.spinics.net/lists/arm-kernel/msg203686.html

Includes mach-omap2 fixes from Igor Grinberg.

Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/mach-rpc/time.c

@@ -82,14 +82,9 @@ static struct irqaction ioc_timer_irq = {
 /*
  * Set up timer interrupt.
  */
-static void __init ioc_timer_init(void)
+void __init ioc_timer_init(void)
 {
 	arch_gettimeoffset = ioc_timer_gettimeoffset;
 	ioctime_init();
 	setup_irq(IRQ_TIMER0, &ioc_timer_irq);
 }
-
-struct sys_timer ioc_timer = {
-	.init		= ioc_timer_init,
-};
-