fpga: Update copyright

Update copyright on recently changed files.

Signed-off-by: michael-west <michael.west@ettus.com>


Original-commit: 92c09f7f766586683ebd67bb3a57005250c4d81d

lib/control/fe_control.v

@@ -1,5 +1,6 @@
 //
 // Copyright 2019 Ettus Research, a National Instruments Brand
+// Copyright 2023 Ettus Research, a National Instruments Brand
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 //

lib/rfnoc/blocks/rfnoc_block_radio/rx_frontend_gen3.v

@@ -2,6 +2,7 @@
 // Copyright 2015 Ettus Research LLC
 // Copyright 2018 Ettus Research, a National Instruments Company
 // Copyright 2020 Ettus Research, a National Instruments Brand
+// Copyright 2023 Ettus Research, a National Instruments Brand
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 //

lib/rfnoc/blocks/rfnoc_block_radio/rx_frontend_gen3_tb/rx_frontend_gen3_tb.sv

@@ -1,5 +1,6 @@
 //
 // Copyright 2021 Ettus Research, a National Instruments Brand
+// Copyright 2023 Ettus Research, a National Instruments Brand
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 //

lib/rfnoc/ddc.v

@@ -1,6 +1,7 @@
 //
 // Copyright 2016 Ettus Research
 // Copyright 2018 Ettus Research, a National Instruments Company
+// Copyright 2023 Ettus Research, a National Instruments Brand
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 //