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-sa1100/badge4.c

@@ -336,7 +336,7 @@ MACHINE_START(BADGE4, "Hewlett-Packard Laboratories BadgePAD 4")
 	.nr_irqs	= SA1100_NR_IRQS,
 	.init_irq	= sa1100_init_irq,
 	.init_late	= sa11x0_init_late,
-	.timer		= &sa1100_timer,
+	.init_time	= sa1100_timer_init,
 #ifdef CONFIG_SA1111
 	.dma_zone_size	= SZ_1M,
 #endif