Search for partition maps in IMAGES dir as well

Partition images are allowed to be in either IMAGES/ or RADIO/ dir of a
target_files zip, so when searching for .map files we should look in
both dirs.

Test: th
Bug: 227848550
Change-Id: I0a9d2c582d8f5d570237434902fac012513c9aad
diff --git a/tools/releasetools/ota_utils.py b/tools/releasetools/ota_utils.py
index 466cafb..68c6887 100644
--- a/tools/releasetools/ota_utils.py
+++ b/tools/releasetools/ota_utils.py
@@ -762,6 +762,9 @@
   path = os.path.join(target_files_dir, "RADIO", partition + ".map")
   if os.path.exists(path):
     return path
+  path = os.path.join(target_files_dir, "IMAGES", partition + ".map")
+  if os.path.exists(path):
+    return path
   return ""