mb/**/gma-mainboard.ads: Remove copyright statements

They are already in AUTHORS.

Change-Id: I315c0c57babfa239e3d7c501a4183b8996999e6e
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39659
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/mainboard/asrock/b75pro3-m/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Iru Cai <mytbk920423@gmail.com>
---
 -- 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 2 of the License, or

src/mainboard/hp/compaq_8200_elite_sff/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2018 Patrick Rudolph <siro@das-labor.org>
---
 -- 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 2 of the License, or

src/mainboard/hp/snb_ivb_laptops/variants/2570p/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Iru Cai <mytbk920423@gmail.com>
---
 -- 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 2 of the License, or

src/mainboard/hp/snb_ivb_laptops/variants/2760p/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Iru Cai <mytbk920423@gmail.com>
---
 -- 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 2 of the License, or

src/mainboard/hp/snb_ivb_laptops/variants/8460p/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Iru Cai <mytbk920423@gmail.com>
---
 -- 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 2 of the License, or

src/mainboard/hp/snb_ivb_laptops/variants/8470p/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Iru Cai <mytbk920423@gmail.com>
---
 -- 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 2 of the License, or

src/mainboard/hp/snb_ivb_laptops/variants/revolve_810_g1/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Iru Cai <mytbk920423@gmail.com>
---
 -- 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 2 of the License, or

src/mainboard/hp/z220_sff_workstation/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2018 Patrick Rudolph <siro@das-labor.org>
---
 -- 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 2 of the License, or

src/mainboard/lenovo/t430s/variants/t430s/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Bill XIE persmule@gmail.com
---
 -- 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 2 of the License, or

src/mainboard/lenovo/t430s/variants/t431s/gma-mainboard.ads

@@ -1,6 +1,4 @@
 --
--- Copyright (C) 2017 Bill XIE persmule@gmail.com
---
 -- 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 2 of the License, or