astlpc: Ensure the status update propogates on shutdown

In addition to clearing the BMC Ready and Channel Active bits, clear OBF
to ensure the write to ODR doesn't block.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ib13804f0c4f8a3d60ecb51cc75515ecb87542b8b
diff --git a/astlpc.c b/astlpc.c
index 053de11..91fba85 100644
--- a/astlpc.c
+++ b/astlpc.c
@@ -1189,7 +1189,7 @@
 {
 	/* Clear channel-active and bmc-ready */
 	if (astlpc->mode == MCTP_BINDING_ASTLPC_MODE_BMC)
-		mctp_astlpc_kcs_set_status(astlpc, KCS_STATUS_OBF);
+		mctp_astlpc_kcs_set_status(astlpc, 0);
 	__mctp_free(astlpc);
 }