Add non blackpill F4x1 config files (#16600)

* Add non blackpill F4x1 config files

* Move ld files

* Remove f401 i2c bodges

* more bodge?

* Update to recommended defaults

keyboards/handwired/onekey/blackpill_f401/blackpill_f401.c

@@ -1,23 +0,0 @@
-/* Copyright 2020 Sergey Vlasov (sigprof)
- *
- * 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 QMK_KEYBOARD_H
-
-void board_init(void) {
-    // B9 is configured as I2C1_SDA_PIN in the board file; that function must be
-    // disabled before using B7 as I2C1_SDA.
-    setPinInputHigh(B9);
-}