x86/Voyager: remove HOTPLUG_CPU Kconfig quirk

Voyager has this Kconfig quirk:

 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
	depends on SMP && HOTPLUG && !X86_VOYAGER

But this exception will be moot once Voyager starts using the
generic x86 code.
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/Kconfig

@@ -1470,7 +1470,7 @@ config PHYSICAL_ALIGN
 
 config HOTPLUG_CPU
 	bool "Support for hot-pluggable CPUs"
-	depends on SMP && HOTPLUG && !X86_VOYAGER
+	depends on SMP && HOTPLUG
 	---help---
 	  Say Y here to allow turning CPUs off and on. CPUs can be
 	  controlled through /sys/devices/system/cpu.