Remove useless "ifdef KEYBOARD_*" (#20078)

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

keyboards/helix/helix.c

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

keyboards/helix/helix.h

@@ -1,19 +0,0 @@
-#pragma once
-
-#include "quantum.h"
-
-#ifdef KEYBOARD_helix_rev1
-    #include "rev1.h"
-#endif
-#ifdef KEYBOARD_helix_rev2
-    #include "rev2.h"
-#endif
-#ifdef KEYBOARD_helix_rev3_5rows
-    #include "rev3_5rows.h"
-#endif
-#ifdef KEYBOARD_helix_rev3_4rows
-    #include "rev3_4rows.h"
-#endif
-#ifdef KEYBOARD_helix_pico
-    #include "pico.h"
-#endif

keyboards/helix/pico/pico.c

@@ -13,7 +13,7 @@
  * 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 "helix.h"
+#include "pico.h"
 
 // Each keymap.c should use is_keyboard_master() instead of 'is_master'.
 // But keep 'is_master' for a while for backwards compatibility

keyboards/helix/pico/pico.h

@@ -15,7 +15,7 @@
  */
 #pragma once
 
-#include "helix.h"
+#include "quantum.h"
 
 // Each keymap.c should use is_keyboard_master() instead of 'is_master', 'has_usb()'.
 // But keep 'is_master' for a while for backwards compatibility

keyboards/helix/rev2/rev2.c

@@ -13,7 +13,7 @@
  * 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 "helix.h"
+#include "rev2.h"
 
 // Each keymap.c should use is_keyboard_master() instead of 'is_master'.
 // But keep 'is_master' for a while for backwards compatibility

keyboards/helix/rev2/rev2.h

@@ -15,7 +15,7 @@
  */
 #pragma once
 
-#include "helix.h"
+#include "quantum.h"
 
 bool is_mac_mode(void);
 void set_mac_mode_kb(bool macmode);

keyboards/helix/rev3_4rows/rev3_4rows.c

@@ -14,7 +14,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "helix.h"
+#include "rev3_4rows.h"
 
 bool is_mac_mode(void) {
     return keymap_config.swap_lalt_lgui == false;

keyboards/helix/rev3_5rows/rev3_5rows.c

@@ -14,7 +14,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "helix.h"
+#include "rev3_5rows.h"
 
 bool is_mac_mode(void) {
     return keymap_config.swap_lalt_lgui == false;