Blackfin: add some isram-driver self tests

Make it easy to figure out if code changes here are correct.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/Kconfig.debug b/arch/blackfin/Kconfig.debug
index 1fc4981..87f195e 100644
--- a/arch/blackfin/Kconfig.debug
+++ b/arch/blackfin/Kconfig.debug
@@ -252,4 +252,10 @@
 
 	  Say N here to disable that check to improve the performance.
 
+config BFIN_ISRAM_SELF_TEST
+	bool "isram boot self tests"
+	default n
+	help
+	  Run some self tests of the isram driver code at boot.
+
 endmenu