refactor(pm): Remove scanned behavior trigger.

* Remove the painful scanned behavior trigger for now, future enhancement
  will restore this high level functionality using kscan directly.

app/dts/bindings/zmk,gpio-scanned-key-behavior-trigger.yaml

@@ -1,31 +0,0 @@
-# Copyright (c) 2023 The ZMK Contributors
-# SPDX-License-Identifier: MIT
-
-description: |
-  Driver for a dedicated key triggered by matrix scanning for invoking a connected behavior.
-
-compatible: "zmk,gpio-scanned-key-behavior-trigger"
-
-include: base.yaml
-
-properties:
-  key:
-    type: phandle
-    required: true
-    description: The GPIO key that triggers wake via interrupt
-  bindings:
-    type: phandle
-    required: true
-    description: The behavior to invoke when the GPIO key is pressed
-  debounce-press-ms:
-    type: int
-    default: 5
-    description: Debounce time for key press in milliseconds. Use 0 for eager debouncing.
-  debounce-release-ms:
-    type: int
-    default: 5
-    description: Debounce time for key release in milliseconds.
-  debounce-scan-period-ms:
-    type: int
-    default: 1
-    description: Time between reads in milliseconds when any key is pressed.