ARM: bcm: provide common arch init for DT clocks

With arch/arm calling of_clk_init(NULL) and clocksource_of_init()
this is no longer needed. The former is useful because we can make
use of dummy fixed clocks for drivers until the bcm281xx common
clock driver is ready.
Signed-off-by: NMatt Porter <matt.porter@linaro.org>
Reviewed-by: NMarkus Mayer <markus.mayer@linaro.org>
Acked-by: NChristian Daudt <csd@broadcom.com>

arch/arm/mach-bcm/board_bcm281xx.c

@@ -68,7 +68,6 @@ static void __init board_init(void)
 static const char * const bcm11351_dt_compat[] = { "brcm,bcm11351", NULL, };
 
 DT_MACHINE_START(BCM11351_DT, "Broadcom Application Processor")
-	.init_time = clocksource_of_init,
 	.init_machine = board_init,
 	.restart = bcm_kona_restart,
 	.dt_compat = bcm11351_dt_compat,