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

Platforms/platform-esp32/bindings/espressif,esp32-pwm-ledc.yaml

@@ -0,0 +1,33 @@
+description: ESP32 LEDC-backed generic PWM output
+
+compatible: "espressif,esp32-pwm-ledc"
+
+properties:
+  pin:
+    type: phandles
+    required: true
+    description: PWM output pin
+  period-ns:
+    type: int
+    required: true
+    description: The PWM period, in nanoseconds
+  duty-ns:
+    type: int
+    default: 0
+    description: The PWM duty cycle (active time within one period), in nanoseconds
+  inverted:
+    type: boolean
+    default: false
+    description: Whether the output polarity is inverted
+  duty-resolution:
+    type: int
+    default: 10
+    description: LEDC duty resolution in bits, defined by ledc_timer_bit_t
+  ledc-timer:
+    type: int
+    required: true
+    description: LEDC timer index, defined by ledc_timer_t
+  ledc-channel:
+    type: int
+    required: true
+    description: LEDC channel index, defined by ledc_channel_t