arm: omap2: timer: always call clocksource_of_init() when DT

If booting with DT, let's make sure to always
call clocksource_of_init() as this will make
it easier to move timer code to drivers/clocksource
in the future.
Signed-off-by: Felipe Balbi <balbi@ti.com>

arch/arm/mach-omap2/timer.c

@@ -496,6 +496,9 @@ void __init omap_sync32k_timer_init(void)
 {
 	__omap_sync32k_timer_init(1, "timer_32k_ck", "ti,timer-alwon",
 			2, "timer_sys_ck", NULL, false);
+
+	if (of_have_populated_dt())
+		clocksource_of_init();
 }
 
 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM43XX)