Move crypt commands to a different listener in vold

In order to prevent this bug from happening, we must allow vold cryptfs
commands to complete while a long running mount is underway.

While waiting for vold to be changed to a binder interface, we will simply
create two listeners, one for cryptfs and one for everything else.

Bug: 19197175
Change-Id: I819f6a54c0a232826016823f2fde3adf7be31f9d

file_contexts

@@ -82,6 +82,7 @@
 /dev/socket(/.*)?	u:object_r:socket_device:s0
 /dev/socket/adbd	u:object_r:adbd_socket:s0
 /dev/socket/sap_uim_socket[0-9]        u:object_r:sap_uim_socket:s0
+/dev/socket/cryptd	u:object_r:vold_socket:s0
 /dev/socket/dnsproxyd	u:object_r:dnsproxyd_socket:s0
 /dev/socket/dumpstate	u:object_r:dumpstate_socket:s0
 /dev/socket/fwmarkd	u:object_r:fwmarkd_socket:s0