[Chore] Separate out vllm.utils.mem_utils (#27143)

Signed-off-by: iAmir97 <Amir.balwel@embeddedllm.com>
Signed-off-by: iAmir97 <71513472+iAmir97@users.noreply.github.com>
Co-authored-by: iAmir97 <Amir.balwel@embeddedllm.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

tests/utils.py

@@ -46,10 +46,10 @@ from vllm.platforms import current_platform
 from vllm.transformers_utils.tokenizer import get_tokenizer
 from vllm.utils import (
     FlexibleArgumentParser,
-    GB_bytes,
     cuda_device_count_stateless,
     get_open_port,
 )
+from vllm.utils.mem_constants import GB_bytes
 
 if current_platform.is_rocm():
     from amdsmi import (