remove the dead X86_REMOTE_DEBUG option

This patch removes the dead X86_REMOTE_DEBUG option.

Signed-off-by: Adrian Bunk <bunk@kernel.org>

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 6f32beb2..761ca7b 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -112,7 +112,4 @@
 	  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