Blackfin: add preliminary support for STACKTRACE

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index d68cb0d..77ec14f 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -55,6 +55,9 @@
 config GENERIC_CALIBRATE_DELAY
 	def_bool y
 
+config STACKTRACE_SUPPORT
+	def_bool y
+
 config TRACE_IRQFLAGS_SUPPORT
 	def_bool y