[Bugfix] Fix gemma4 crash on CPU: guard mem_get_info call (#44615)

Signed-off-by: ADHITHYA BALAKRISHNAN <adhithya.balakrishnan@multicorewareinc.com>

vllm/platforms/cpu.py

@@ -92,6 +92,11 @@ class CpuPlatform(Platform):
 
         return meminfo.total_memory
 
+    @classmethod
+    def mem_get_info(cls) -> tuple[int, int]:
+        meminfo = get_memory_node_info()
+        return meminfo.available_memory, meminfo.total_memory
+
     @classmethod
     def set_device(cls, device: torch.device) -> None:
         """