Update crypto submodule to mbedcrypto-0.1.0b
diff --git a/.gitmodules b/.gitmodules
index 3490a17..d25c9a6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "crypto"]
 	path = crypto
 	url = git@github.com:ARMmbed/mbedtls-psa.git
-	branch = feature-psa-tls-integration-proposed
+	branch = feature-psa