Add support for the Clog (#1092)

* Add support for the Clog

* format DTSI definition

* add a default keymap

* update copyright year, reduce conf to minimum

app/boards/shields/clog/Kconfig.defconfig

@@ -0,0 +1,19 @@
+# Copyright (c) 2022 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if SHIELD_CLOG_LEFT
+
+config ZMK_KEYBOARD_NAME
+	default "Clog"
+
+config ZMK_SPLIT_BLE_ROLE_CENTRAL
+	default y
+
+endif
+
+if SHIELD_CLOG_LEFT || SHIELD_CLOG_RIGHT
+
+config ZMK_SPLIT
+	default y
+
+endif