Blackfin: initial support for ftrace

Just the basic ftrace support here -- mcount and the ftrace stub.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index d03fd63..ea8d92c 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -19,6 +19,7 @@
 
 config BLACKFIN
 	def_bool y
+	select HAVE_FUNCTION_TRACER
 	select HAVE_IDE
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2