Merge identical key/val pairs in dynamic partition info

We might add new values to dynamic_partition_info.txt, so some kind of
generic fallback mechanism is needed. If keys are different, we need to
decided on a case-by-case basis which side takes precedence. For
example, Virtual AB requires vendor support, so vendor side takes
precedence. VABC on T+ devices are implemented entirely in system, so
system/framework side takes precedence.

Bug: 230876542
Test: th
Change-Id: I67747368547d3ef3e29ad64f8f818ef4c5896246

tools/releasetools/common.py

@@ -1188,10 +1188,14 @@ def MergeDynamicPartitionInfoDicts(framework_dict, vendor_dict):
     return " ".join(sorted(combined))
 
   if (framework_dict.get("use_dynamic_partitions") !=
-          "true") or (vendor_dict.get("use_dynamic_partitions") != "true"):
+        "true") or (vendor_dict.get("use_dynamic_partitions") != "true"):
     raise ValueError("Both dictionaries must have use_dynamic_partitions=true")
 
   merged_dict = {"use_dynamic_partitions": "true"}
+  # For keys-value pairs that are the same, copy to merged dict
+  for key in vendor_dict.keys():
+    if key in framework_dict and framework_dict[key] == vendor_dict[key]:
+      merged_dict[key] = vendor_dict[key]
 
   merged_dict["dynamic_partition_list"] = uniq_concat(
       framework_dict.get("dynamic_partition_list", ""),