Remove useless "ifdef KEYBOARD_*" (#20078)

Co-authored-by: Nick Brassel <nick@tzarc.org>

keyboards/redox/redox.c

@@ -1,16 +0,0 @@
-/* Copyright 2017 REPLACE_WITH_YOUR_NAME
- *
- * 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
- * (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/>.
- */
-#include "redox.h"

keyboards/redox/redox.h

@@ -1,25 +0,0 @@
-/* Copyright 2017 REPLACE_WITH_YOUR_NAME
- *
- * 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
- * (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/>.
- */
-
-#pragma once
-
-#if defined(KEYBOARD_redox_rev1)
-#     include "rev1.h"
-#elif defined(KEYBOARD_redox_media)
-#    include "media.h"
-#endif
-
-#include "quantum.h"

keyboards/redox/rev1/proton_c/proton_c.c

@@ -1,4 +0,0 @@
-// Copyright 2022 xerootg
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#include "proton_c.h"

keyboards/redox/rev1/proton_c/proton_c.h

@@ -1,6 +0,0 @@
-// Copyright 2022 xerootg
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#pragma once
-
-#include "rev1.h"

keyboards/redox/rev1/rev1.c

@@ -1 +0,0 @@
-#include "redox.h"

keyboards/redox/rev1/rev1.h

@@ -1,11 +1,5 @@
 #pragma once
 
-#include "redox.h"
-
-#if defined(KEYBOARD_redox_rev1_proton_c)
-#    include "proton_c.h"
-#endif
-
 #include "quantum.h"
 
 #define LAYOUT( \