Remove unused adapter_ops->read_link_policy function

There is no code to react to the command complete of this HCI command so
there's really no value in issuing it to begin with.
diff --git a/plugins/hciops.c b/plugins/hciops.c
index c446fd0..499e193 100644
--- a/plugins/hciops.c
+++ b/plugins/hciops.c
@@ -2435,17 +2435,6 @@
 	return 0;
 }
 
-static int hciops_read_link_policy(int index)
-{
-	DBG("hci%d", index);
-
-	if (hci_send_cmd(SK(index), OGF_LINK_POLICY,
-				OCF_READ_DEFAULT_LINK_POLICY, 0, NULL) < 0)
-		return -errno;
-
-	return 0;
-}
-
 static int hciops_disconnect(int index, uint16_t handle)
 {
 	disconnect_cp cp;
@@ -2705,7 +2694,6 @@
 	.read_local_version = hciops_read_local_version,
 	.read_local_features = hciops_read_local_features,
 	.read_local_ext_features = hciops_read_local_ext_features,
-	.read_link_policy = hciops_read_link_policy,
 	.disconnect = hciops_disconnect,
 	.remove_bonding = hciops_remove_bonding,
 	.request_authentication = hciops_request_authentication,
diff --git a/plugins/mgmtops.c b/plugins/mgmtops.c
index 69297db..97853f9 100644
--- a/plugins/mgmtops.c
+++ b/plugins/mgmtops.c
@@ -636,12 +636,6 @@
 	return -ENOSYS;
 }
 
-static int mgmt_read_link_policy(int index)
-{
-	DBG("index %d", index);
-	return -ENOSYS;
-}
-
 static int mgmt_disconnect(int index, uint16_t handle)
 {
 	DBG("index %d handle %u", index, handle);
@@ -762,7 +756,6 @@
 	.read_local_version = mgmt_read_local_version,
 	.read_local_features = mgmt_read_local_features,
 	.read_local_ext_features = mgmt_read_local_ext_features,
-	.read_link_policy = mgmt_read_link_policy,
 	.disconnect = mgmt_disconnect,
 	.remove_bonding = mgmt_remove_bonding,
 	.request_authentication = mgmt_request_authentication,
diff --git a/src/adapter.c b/src/adapter.c
index 551e39a..8e715dc 100644
--- a/src/adapter.c
+++ b/src/adapter.c
@@ -2436,8 +2436,6 @@
 
 	memcpy(dev->features, features, 8);
 
-	adapter_ops->read_link_policy(adapter->dev_id);
-
 	adapter->current_cod = 0;
 
 	adapter_setup(adapter, mode);
diff --git a/src/adapter.h b/src/adapter.h
index 3a2cf9c..a9f72e3 100644
--- a/src/adapter.h
+++ b/src/adapter.h
@@ -215,7 +215,6 @@
 	int (*read_local_version) (int index, struct hci_version *ver);
 	int (*read_local_features) (int index, uint8_t *features);
 	int (*read_local_ext_features) (int index);
-	int (*read_link_policy) (int index);
 	int (*disconnect) (int index, uint16_t handle);
 	int (*remove_bonding) (int index, bdaddr_t *bdaddr);
 	int (*request_authentication) (int index, uint16_t handle);