b2xx: Updating FPGA source with recent bugfixes.

Original-commit: 4b4365a517938b365af57674a3ab1462432c2c3a

lib/control/simple_spi_core.v

@@ -1,7 +1,19 @@
 //
 // Copyright 2012 Ettus Research LLC
 //
-
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
 
 // Simple SPI core, the simplest, yet complete spi core I can think of