Device migrations, new drivers, cleanup (#567)

* **New Features**
  * Added native display support for ST7796, ILI9341, and ST7789 panels across supported boards.
  * Added FT5x06 and FT6x36 touchscreen support.
  * Generic PWM driver
  * ESP32 PWM driver
  * Generic RGB LED driver
  * RGB PWM LED driver
  * RGB GPIO LED driver
  * Implementation of RGB LED for various boards

* **Improvements**
  * Updated board hardware descriptions to use explicit display/touch/backlight device-tree bindings and disabled deprecated HAL usage.
  * Improved display and touch-driver cleanup to prevent stale resources and improve shutdown reliability.
  * Pinned esp-hosted library to a fixed version
 
* **Deletions**
  * Obsolete placeholder display
  * Legacy ILI9488 support.
  * ESP32-specific LEDC PWM implementation

TactilityKernel/bindings/rgb-led-pwm.yaml

@@ -0,0 +1,27 @@
+description: >
+  RGB LED driven by 3 PWM devices (e.g. espressif,esp32-pwm-ledc or pwm-generic),
+  one per channel, giving each channel dimming via the wrapped device's duty cycle.
+
+compatible: "rgb-led-pwm"
+
+properties:
+  pwm-red:
+    type: phandle
+    required: true
+    description: PWM device driving the red channel
+  pwm-green:
+    type: phandle
+    required: true
+    description: PWM device driving the green channel
+  pwm-blue:
+    type: phandle
+    required: true
+    description: PWM device driving the blue channel
+  enabled:
+    type: boolean
+    default: false
+    description: Whether the LED is turned on by default
+  default-color:
+    type: values
+    default: [255, 255, 255]
+    description: Color applied when the LED is turned on by default