x86: Remove EXPERIMENTAL restriction from CONFIG_HOTPLUG_CPU

Index: linux/arch/x86/Kconfig
===================================================================
@@ -1365,11 +1365,11 @@ config PHYSICAL_ALIGN
 	  Don't change this unless you know what you are doing.
 
 config HOTPLUG_CPU
-	bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
-	depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
+	bool "Support for suspend on SMP and hot-pluggable CPUs"
+	depends on SMP && HOTPLUG && !X86_VOYAGER
 	---help---
-	  Say Y here to experiment with turning CPUs off and on, and to
-	  enable suspend on SMP systems. CPUs can be controlled through
+	  Say Y here to allow turning CPUs off and on, and to enable
+	  suspend on SMP systems. CPUs can be controlled through
 	  /sys/devices/system/cpu.
 	  Say N if you want to disable CPU hotplug and don't need to
 	  suspend.