Blackfin: move KGDB selection to the way other arches do it

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/Kconfig

@@ -23,6 +23,7 @@ config RWSEM_XCHGADD_ALGORITHM
 
 config BLACKFIN
 	def_bool y
+	select HAVE_ARCH_KGDB
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_TRACE_MCOUNT_TEST

arch/blackfin/Kconfig.debug

@@ -18,9 +18,6 @@ config DEBUG_STACK_USAGE
 
 	  This option will slow down process creation somewhat.
 
-config HAVE_ARCH_KGDB
-	def_bool y
-
 config DEBUG_VERBOSE
 	bool "Verbose fault messages"
 	default y