Switch to the public crypto submodule url

diff --git a/.gitmodules b/.gitmodules
index d25c9a6..d40f56b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,4 +1,4 @@
 [submodule "crypto"]
 	path = crypto
-	url = git@github.com:ARMmbed/mbedtls-psa.git
-	branch = feature-psa
+	url = git@github.com:ARMmbed/mbed-crypto.git
+	branch = development