Revert "Add a wrapper class PartitionBuildProp"

Revert submission 1297095

Bug: 156131275
Reason for revert: Broken build
Reverted Changes:
I2fe7e93a2:Add a wrapper class PartitionBuildProp
Iac093a40d:Calculate the runtime fingerprint prefixes from bu...

Change-Id: Ie846d23b9f5c3325d021236725826512be7a3c78
diff --git a/tools/releasetools/check_target_files_vintf.py b/tools/releasetools/check_target_files_vintf.py
index 95d09cc..b3d491f 100755
--- a/tools/releasetools/check_target_files_vintf.py
+++ b/tools/releasetools/check_target_files_vintf.py
@@ -80,9 +80,8 @@
            '--property', 'ro.boot.product.vendor.sku=' + vendor_sku]
           for odm_sku in odm_skus for vendor_sku in vendor_skus]
 
-
 def GetArgsForShippingApiLevel(info_dict):
-  shipping_api_level = info_dict['vendor.build.prop'].GetProp(
+  shipping_api_level = info_dict['vendor.build.prop'].get(
       'ro.product.first_api_level')
   if not shipping_api_level:
     logger.warning('Cannot determine ro.product.first_api_level')