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-picoxcell/common.c

@@ -99,7 +99,7 @@ DT_MACHINE_START(PICOXCELL, "Picochip picoXcell")
 	.nr_irqs	= NR_IRQS_LEGACY,
 	.init_irq	= picoxcell_init_irq,
 	.handle_irq	= vic_handle_irq,
-	.timer		= &dw_apb_timer,
+	.init_time	= dw_apb_timer_init,
 	.init_machine	= picoxcell_init_machine,
 	.dt_compat	= picoxcell_dt_match,
 	.restart	= picoxcell_wdt_restart,

arch/arm/mach-picoxcell/common.h

@@ -12,6 +12,6 @@
 
 #include <asm/mach/time.h>
 
-extern struct sys_timer dw_apb_timer;
+extern void dw_apb_timer_init(void);
 
 #endif /* __PICOXCELL_COMMON_H__ */