kconfig: remove unused config DEBUG_IRQS

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/arch/x86/core/Kconfig b/arch/x86/core/Kconfig
index a7672ae..4d94874 100644
--- a/arch/x86/core/Kconfig
+++ b/arch/x86/core/Kconfig
@@ -104,12 +104,4 @@
 	This option stores the GDT in RAM instead of ROM, so that it may
 	be modified at runtime at the expense of some memory.
 
-config DEBUG_IRQS
-	bool
-	prompt "Extra interrupt debugging functionality"
-	default n
-	help
-	Enable additional debugging services for interrupts. May nontrivially
-	increase ROM size, so use only when you need it.
-
 endmenu