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>
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index 948bcaa..b435027 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -79,13 +79,13 @@
 
 extern void omap2_init_common_infrastructure(void);
 
-extern struct sys_timer omap2_timer;
-extern struct sys_timer omap3_timer;
-extern struct sys_timer omap3_secure_timer;
-extern struct sys_timer omap3_gp_timer;
-extern struct sys_timer omap3_am33xx_timer;
-extern struct sys_timer omap4_timer;
-extern struct sys_timer omap5_timer;
+extern void omap2_sync32k_timer_init(void);
+extern void omap3_sync32k_timer_init(void);
+extern void omap3_secure_sync32k_timer_init(void);
+extern void omap3_gp_gptimer_timer_init(void);
+extern void omap3_am33xx_gptimer_timer_init(void);
+extern void omap4_local_timer_init(void);
+extern void omap5_realtime_timer_init(void);
 
 void omap2420_init_early(void);
 void omap2430_init_early(void);