mctp-demux-daemon: Exploit binding mctp_*_init_pollfd() APIs

Once bindings are correctly implemented as async the daemon itself will
follow.

Finally, now they're unused, drop the mctp_*_get_fd() APIs as they're
strictly less powerful.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ibc2bbc1d75b031e4422429d606e6345d794cb44d
diff --git a/utils/mctp-astlpc-daemon.c b/utils/mctp-astlpc-daemon.c
index 3852bd4..f984eaf 100644
--- a/utils/mctp-astlpc-daemon.c
+++ b/utils/mctp-astlpc-daemon.c
@@ -77,8 +77,7 @@
 		pollfds[0].fd = STDIN_FILENO;
 		pollfds[0].events = POLLIN;
 
-		pollfds[1].fd = mctp_astlpc_get_fd(astlpc);
-		pollfds[1].events = POLLIN;
+		mctp_astlpc_init_pollfd(astlpc, &pollfds[1]);
 
 		rc = poll(pollfds, 2, -1);
 		if (rc < 0)