SWDEV-463399: amdsmi_get_gpu_vram_info() adds bit-width

Driver info `amdgpu_gpu_info.vram_bit_width` is exposed through amdsmi_get_gpu_vram_info().

Code changes related to the following:
  * API
  * CLI
  * Unit tests
  * Examples

Change-Id: I8abd8db7a603078b2b1c008b2685cecf35caf3d2
Signed-off-by: Oliveira, Daniel <daniel.oliveira@amd.com>

py-interface/amdsmi_interface.py

@@ -1770,6 +1770,7 @@ def amdsmi_get_gpu_vram_info(
         "vram_type": vram_info.vram_type,
         "vram_vendor": vram_info.vram_vendor,
         "vram_size": vram_info.vram_size,
+        "vram_bit_width": vram_info.vram_bit_width
     }