x86, sched: enable wchan config menu item on 64-bit

Enable the wchan config menu item for now on x86-64 arch?  This will
at least allow people to enable/disable frame pointers on scheduler
functions.
Signed-off-by: NKen Chen <kenchen@google.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/Kconfig

@@ -367,7 +367,7 @@ config X86_RDC321X
 config SCHED_NO_NO_OMIT_FRAME_POINTER
 	def_bool y
 	prompt "Single-depth WCHAN output"
-	depends on X86_32
+	depends on X86
 	help
 	  Calculate simpler /proc/<PID>/wchan values. If this option
 	  is disabled then wchan values will recurse back to the