HOGP: Clear pending operations for a given device on connect

If there are any HID operations scheduled after disconnect, mark the
device as no longer executing after establishing connection. Otherwise
we'll be unable to send any HID commands to it.

Change-Id: Ie1bb622388a3bcb574dec3dde76ef4518ee1102f

bta/hh/bta_hh_le.c

@@ -1295,6 +1295,8 @@ void bta_hh_gatt_open(tBTA_HH_DEV_CB *p_cb, tBTA_HH_DATA *p_buf)
 
         bta_hh_cb.le_cb_index[BTA_HH_GET_LE_CB_IDX(p_cb->hid_handle)] = p_cb->index;
 
+        gatt_op_queue_clean(p_cb->conn_id);
+
 #if BTA_HH_DEBUG == TRUE
         APPL_TRACE_DEBUG("hid_handle = %2x conn_id = %04x cb_index = %d", p_cb->hid_handle, p_cb->conn_id, p_cb->index);
 #endif