remove the dead X86_REMOTE_DEBUG option

This patch removes the dead X86_REMOTE_DEBUG option.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>

arch/x86/Kconfig.debug

@@ -112,7 +112,4 @@ config IOMMU_LEAK
 	  Add a simple leak tracer to the IOMMU code. This is useful when you
 	  are debugging a buggy device driver that leaks IOMMU mappings.
 
-#config X86_REMOTE_DEBUG
-#	bool "kgdb debugging stub"
-
 endmenu