ARM: substitute arch_idle()

Now that all implementations of arch_idle() are equivalent to cpu_do_idle()
we can just use the later directly and stop including mach/system.h.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-and-tested-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index ba9e7ef..008e7ce 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -61,8 +61,6 @@
 
 static volatile int hlt_counter;
 
-#include <mach/system.h>
-
 void disable_hlt(void)
 {
 	hlt_counter++;
@@ -191,7 +189,7 @@
 	if (arm_pm_idle)
 		arm_pm_idle();
 	else
-		arch_idle();
+		cpu_do_idle();
 	local_irq_enable();
 }