Complete vnd7050aj module integration

- Move DTS binding from project root to module folder
- Update module.yml to use correct dts_root path
- Restructure module for better organization and portability
- All module files now self-contained in modules/vnd7050aj/

Module structure:
- CMakeLists.txt: Uses zephyr_library for proper integration
- Kconfig: Module configuration options
- dts/bindings/: Device tree binding definitions
- include/: Public header files
- src/: Module source code
- zephyr/module.yml: Module discovery and configuration

Build verified successful on both x86 and ARM targets.

dts/bindings/vnd7050aj.yaml

@@ -1,21 +0,0 @@
-description: STMicroelectronics VND7050AJ High-Side Driver
-
-compatible:
-  - st,vnd7050aj
-
-properties:
-  label:
-    type: string
-    required: true
-    description: Human readable name for the device
-
-  # Example property for a GPIO pin, adjust as needed
-  gpio-enable-pin:
-    type: phandle-array
-    required: true
-    description: GPIO pin for enabling the device
-
-  # Add other properties relevant to the VND7050AJ, e.g.,
-  # current-sense-gpios:
-  #   type: phandle-array
-  #   description: GPIO pin for current sense feedback