arm: berlin: remove non-necessary flush_cache_all()

I believe the flush_cache_all() after scu_enable() is to "Ensure that
the data accessed by CPU0 before the SCU was initialised is visible
to the other CPUs." as commented in scu_enable(). So here
flush_cache_all() is a duplication, remove it.
Signed-off-by: NJisheng Zhang <Jisheng.Zhang@synaptics.com>

arch/arm/mach-berlin/platsmp.c

@@ -81,7 +81,6 @@ static void __init berlin_smp_prepare_cpus(unsigned int max_cpus)
 		goto unmap_scu;
 
 	scu_enable(scu_base);
-	flush_cache_all();
 
 	/*
 	 * Write the first instruction the CPU will execute after being reset