move async raid6 test to lib/Kconfig.debug

The prompt for "Self test for hardware accelerated raid6 recovery" does not
belong in the top level configuration menu.  All the options in
crypto/async_tx/Kconfig are selected and do not depend on CRYPTO.
Kconfig.debug seems like a reasonable fit.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1b4afd2..0deaf81 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1150,6 +1150,19 @@
 
 	  If unsure, say N.
 
+config ASYNC_RAID6_TEST
+	tristate "Self test for hardware accelerated raid6 recovery"
+	depends on ASYNC_RAID6_RECOV
+	select ASYNC_MEMCPY
+	---help---
+	  This is a one-shot self test that permutes through the
+	  recovery of all the possible two disk failure scenarios for a
+	  N-disk array.  Recovery is performed with the asynchronous
+	  raid6 recovery routines, and will optionally use an offload
+	  engine if one is available.
+
+	  If unsure, say N.
+
 source "samples/Kconfig"
 
 source "lib/Kconfig.kgdb"