arm: kconfig: dis-allow hotplug on MSM

MSM doesn't support hotplug, so we prevent it from being
selected in Kconfig.
Signed-off-by: NDaniel Walker <dwalker@codeaurora.org>

arch/arm/Kconfig

@@ -1284,6 +1284,7 @@ config NR_CPUS
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
 	depends on SMP && HOTPLUG && EXPERIMENTAL
+	depends on !ARCH_MSM
 	help
 	  Say Y here to experiment with turning CPUs off and on.  CPUs
 	  can be controlled through /sys/devices/system/cpu.