libpdx_uds: Handle EACCES error when connecting to PDX service

There is a race condition in the way init process creates socket
files before it forks into a child (see system/core/init/util.cpp,
function create_socket()). It first creates a socket, then calls
bind() which creates a file entry, then calls chown/chmod to change
ownership and access permissions of that file object. If a client
process connects to the socket just after bind() was called but before
chmod(), the socket file will have incorrect permissions and the
connect call will be aborted with EACCESS (Permission denied) error.

We should retry connection in case we get EACCESS. A proper fix would
be is to find a way for init to create the file entry with the proper
permissions to start with, and eliminate the race condition altogether.

Bug: 37171113
Test: `lunch sailfish-eng && m -j32` succeeds
      Device boots correctly.
      Error recovery is handled correctly even after adding sleep(5)
      to init process just before calling chmod on the socket.

Change-Id: If97c316daa0c0be5ff7b5aa302a69aa60e9fb237