Initial exploration of split BLE service.

* Service for split peripheral to report
  position state to split central.
* Updated advertising info.
* Behavior for split BT until we have a proper
  event system.

app/boards/shields/kyria/Kconfig.defconfig

@@ -4,4 +4,7 @@ if SHIELD_KYRIA_LEFT || SHIELD_KYRIA_RIGHT
 config ZMK_KEYBOARD_NAME
 	default "Kyria"
 
+config ZMK_SPLIT
+	default y
+
 endif

app/boards/shields/kyria/kyria.dtsi

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: MIT
  */
 
+#include <behaviors/split_bt.dtsi>
 #include <dt-bindings/zmk/matrix-transform.h>
 
 / {