New kernel drivers and device implementation updates (#561)

- Added modular device support and devicetree bindings for ILI9341, ILI9488, CST816S, XPT2046, and GPIO button input, updating several board configurations for display/touch/backlight/keyboard/battery.
- Added a setting to control deprecated HAL usage (device property + Kconfig).

Firmware/Kconfig

@@ -77,6 +77,12 @@ menu "Tactility App"
     config TT_TDECK_WORKAROUND
         bool "Temporary work-around until we fix the T-Deck keyboard and trackball settings"
         default n
+    config TT_USE_DEPRECATED_HAL
+        bool "When set to false, it ensures an empty tt::hal::hardwareConfig is made automatically"
+        default y
+        help
+            This allows for migrating projects that don't use the old HAL.
+            When set to 'n', the project has an option to not depend on Tactility and can depend on TactilityKernel instead.
     choice TT_USER_DATA_LOCATION
         prompt "User Data Location"
         default TT_USER_DATA_LOCATION_INTERNAL

Firmware/Source/Main.cpp

@@ -9,8 +9,13 @@
 #include <Simulator.h>
 #endif
 
+#ifdef CONFIG_TT_USE_DEPRECATED_HAL
 // Each board project declares this variable
 extern const tt::hal::Configuration hardwareConfiguration;
+#else
+// Legacy placeholder (required until legacy HAL is cleaned up everywhere)
+extern const tt::hal::Configuration hardwareConfiguration = {};
+#endif
 
 extern "C" {