[Keyboard] Add KMAC PAD (#13104)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/kmac_pad/kmac_pad.c

@@ -0,0 +1,29 @@
+/*
+Copyright 2021 talsu <talsu84@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
+(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 "kmac_pad.h"
+
+void keyboard_pre_init_kb(void) {
+
+    /* Set Backlight pin as output
+     * FN Pin PB3
+     * PAD Pin PB1
+     */
+    setPinOutput(B3);
+    setPinOutput(B1);
+    keyboard_pre_init_user();
+}