sparc64: Kill CONFIG_STACK_DEBUG code.

The generic stack tracer does this job just as well.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/Kconfig.debug b/arch/sparc/Kconfig.debug
index 9d3c889..1b4a831 100644
--- a/arch/sparc/Kconfig.debug
+++ b/arch/sparc/Kconfig.debug
@@ -19,13 +19,10 @@
 	bool "D-cache flush debugging"
 	depends on SPARC64 && DEBUG_KERNEL
 
-config STACK_DEBUG
-	bool "Stack Overflow Detection Support"
-
 config MCOUNT
 	bool
 	depends on SPARC64
-	depends on STACK_DEBUG || FUNCTION_TRACER
+	depends on FUNCTION_TRACER
 	default y
 
 config FRAME_POINTER