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-ixp4xx/nslu2-setup.c

@@ -232,10 +232,6 @@ static void __init nslu2_timer_init(void)
     ixp4xx_timer_init();
 }
 
-static struct sys_timer nslu2_timer = {
-    .init   = nslu2_timer_init,
-};
-
 static void __init nslu2_init(void)
 {
 	uint8_t __iomem *f;
@@ -303,7 +299,7 @@ MACHINE_START(NSLU2, "Linksys NSLU2")
 	.map_io		= ixp4xx_map_io,
 	.init_early	= ixp4xx_init_early,
 	.init_irq	= ixp4xx_init_irq,
-	.timer          = &nslu2_timer,
+	.init_time	= nslu2_timer_init,
 	.init_machine	= nslu2_init,
 #if defined(CONFIG_PCI)
 	.dma_zone_size	= SZ_64M,