GPIO refactored (#495)

* **Refactor**
  * GPIO subsystem moved to a descriptor-based model for per-pin ownership and runtime pin management; many platform drivers now acquire/release descriptors.
  * Device trees and drivers now use GPIO phandle-style pin specifications across all boards and all drivers.

* **Behavior**
  * Device list now encodes per-device status (ok/disabled); boot will skip disabled devices accordingly.

* **Deprecation**
  * Legacy GPIO HAL marked deprecated and replaced with descriptor-based interfaces.

* **Chores**
  * Bindings and platform configs updated to the new GPIO pin-spec format.

Platforms/PlatformEsp32/Bindings/espressif,esp32-spi.yaml

@@ -11,25 +11,24 @@ properties:
     description: |
       The SPI host (controller) to use.
       Defined by spi_host_device_t (e.g. SPI2_HOST, SPI3_HOST).
+  pin-sclk:
+    type: phandle-array
+    default: GPIO_PIN_SPEC_NONE
   pin-mosi:
-    type: int
-    default: GPIO_PIN_NONE
+    type: phandle-array
+    default: GPIO_PIN_SPEC_NONE
     description: MOSI (Data 0) pin
   pin-miso:
-    type: int
-    default: GPIO_PIN_NONE
+    type: phandle-array
+    default: GPIO_PIN_SPEC_NONE
     description: MISO (Data 1) pin
-  pin-sclk:
-    type: int
-    required: true
-    description: Clock pin
   pin-wp:
-    type: int
-    default: GPIO_PIN_NONE
+    type: phandle-array
+    default: GPIO_PIN_SPEC_NONE
     description: WP (Data 2) pin
   pin-hd:
-    type: int
-    default: GPIO_PIN_NONE
+    type: phandle-array
+    default: GPIO_PIN_SPEC_NONE
     description: HD (Data 3) pin
   max-transfer-size:
     type: int