[amd] update rocm to 7.0 (#499)

Author: xuzhao9

tools/rocm_utils.py

@@ -3,11 +3,14 @@
 import subprocess
 
 # defines the default ROCM version to compile against
-DEFAULT_ROCM_VERSION = "6.4"
+DEFAULT_ROCM_VERSION = "7.0"
 ROCM_VERSION_MAP = {
     "6.4": {
         "pytorch_url": "rocm6.4",
     },
+    "7.0": {
+        "pytorch_url": "rocm7.0",
+    },
 }