refactor: Move drivers into properly module.

* Align our driver module layout to properly match Zephyr conventions,
  allowing proper CMake setup to amend the library for each type of driver.

app/module/drivers/sensor/ec11/Kconfig

@@ -0,0 +1,52 @@
+# Copyright (c) 2020 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+menuconfig EC11
+    bool "EC11 Incremental Encoder Sensor"
+    default y
+    depends on DT_HAS_ALPS_EC11_ENABLED
+    depends on GPIO
+    help
+      Enable driver for EC11 incremental encoder sensors.
+
+if EC11
+
+choice
+    prompt "Trigger mode"
+    default EC11_TRIGGER_NONE
+    help
+      Specify the type of triggering to be used by the driver.
+
+config EC11_TRIGGER_NONE
+    bool "No trigger"
+
+config EC11_TRIGGER_GLOBAL_THREAD
+    bool "Use global thread"
+    depends on GPIO
+    select EC11_TRIGGER
+
+config EC11_TRIGGER_OWN_THREAD
+    bool "Use own thread"
+    depends on GPIO
+    select EC11_TRIGGER
+
+endchoice
+
+config EC11_TRIGGER
+    bool
+
+config EC11_THREAD_PRIORITY
+    int "Thread priority"
+    depends on EC11_TRIGGER_OWN_THREAD
+    default 10
+    help
+      Priority of thread used by the driver to handle interrupts.
+
+config EC11_THREAD_STACK_SIZE
+    int "Thread stack size"
+    depends on EC11_TRIGGER_OWN_THREAD
+    default 1024
+    help
+      Stack size of thread used by the driver to handle interrupts.
+
+endif # EC11