Correct formatting for pull request review.

Add ZMK copyright headers where missing.
Add BT_ bindings for testing purposes in keymap.

app/boards/arm/preonic/CMakeLists.txt

@@ -1,4 +1,8 @@
+#
+# Copyright (c) 2020 The ZMK Contributors
+#
 # SPDX-License-Identifier: MIT
+#
 
 list(APPEND EXTRA_DTC_FLAGS "-qq")
 

app/boards/arm/preonic/board.cmake

@@ -1,4 +1,8 @@
+#
+# Copyright (c) 2020 The ZMK Contributors
+#
 # SPDX-License-Identifier: MIT
+#
 
 board_runner_args(dfu-util "--pid=0483:df11" "--alt=0" "--dfuse")
 board_runner_args(jlink "--device=STM32F303VC" "--speed=4000")

app/boards/arm/preonic/preonic_rev3.keymap

@@ -5,6 +5,7 @@
 
 #include <behaviors.dtsi>
 #include <dt-bindings/zmk/keys.h>
+#include <dt-bindings/zmk/bt.h>
 
 #define DEFAULT 0
 #define LOWER   1
@@ -71,7 +72,7 @@
             bindings = <
     &kp F1  &kp F2  &kp F3     &kp F4     &kp F5     &kp F6  &kp F7  &kp F8  &kp F9  &kp F10 &kp F11 &kp F12   
     &trans  &reset  &trans     &trans     &trans     &trans  &trans  &trans  &trans  &trans  &trans  &kp DEL
-	&trans   &trans    &trans    &trans    &trans    &trans    &trans    &trans    &trans    &trans    &trans    &trans    
+    &trans  &trans  &bt BT_PRV &bt BT_NXT &bt BT_CLR &trans  &trans  &trans  &trans  &trans  &trans  &trans    
     &trans  &trans  &trans     &trans     &trans     &trans  &trans  &trans  &trans  &trans  &trans  &trans    
     &trans  &trans  &trans     &trans     &trans     &trans  &trans  &trans  &trans  &trans  &trans  &trans    
             >;