tests: erasure-code: add k=2, m=2 for isa & jerasure

Fixes: http://tracker.ceph.com/issues/18188
Signed-off-by: Loic Dachary <loic@dachary.org>

diff --git a/ceph-erasure-code-corpus b/ceph-erasure-code-corpus
index b5c863495c16975478aa5fc2ca33293c2e0c1a5f..2d7d78b9cc52e8a9529d8cc2d2954c7d375d5dd7 160000 (submodule)
--- a/ceph-erasure-code-corpus
+++ b/ceph-erasure-code-corpus
@@ -1 +1 @@
-Subproject commit b5c863495c16975478aa5fc2ca33293c2e0c1a5f
+Subproject commit 2d7d78b9cc52e8a9529d8cc2d2954c7d375d5dd7