ARM: mvebu: implement CPU hotplug support for Armada XP

This commit implements CPU hotplug support for the Marvell Armada XP
platform. The CPU hotplug stub functions from hotplug.c are moved into
platsmp.c, as it doesn't make much sense to have a separate file just
for these two functions.

In addition, this commit:

 * Implements the ->cpu_die() function of SMP operations by calling
   armada_370_xp_pmsu_idle_enter() to enter the deep idle state for
   CPUs going offline.

 * Implements a dummy ->cpu_kill() function, simply needed for the
   kernel to know we have CPU hotplug support.

 * The armada_xp_boot_secondary() function makes sure to wake up the
   CPU if waiting in deep idle state by sending an IPI. This is
   because armada_xp_boot_secondary() is now used in two different
   situations: for the initial boot of secondary CPUs (where CPU reset
   deassert is used to wake up CPUs) and for CPU hotplug (where an IPI
   is used to take CPU out of deep idle).

 * At boot time, we exit from the idle state in the
   ->smp_secondary_init() hook.

This commit has been tested using CPU hotplug through sysfs
(/sys/devices/system/cpu/cpuX/online) and using kexec.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1401481098-23326-5-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/mach-mvebu/common.h

@@ -22,6 +22,4 @@ int mvebu_cpu_reset_deassert(int cpu);
 void mvebu_pmsu_set_cpu_boot_addr(int hw_cpu, void *boot_addr);
 void mvebu_system_controller_set_cpu_boot_addr(void *boot_addr);
 
-void armada_xp_cpu_die(unsigned int cpu);
-
 #endif