Revert "Enable support for verity writes for VABC targets"

This reverts commit 6bb647fb8548612bbd4bcd8dbbf30a7e7e75a7c0.

Reason for revert: b/186213024

Change-Id: I35054cf263c9118933fb885d5740546af3d4deec
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 94dbd4e..02b2b4d 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -1051,6 +1051,15 @@
         "META/ab_partitions.txt is required for ab_update."
     target_info = common.BuildInfo(OPTIONS.target_info_dict, OPTIONS.oem_dicts)
     source_info = common.BuildInfo(OPTIONS.source_info_dict, OPTIONS.oem_dicts)
+    vendor_prop = source_info.info_dict.get("vendor.build.prop")
+    vabc_used = vendor_prop and \
+        vendor_prop.GetProp("ro.virtual_ab.compression.enabled") == "true" and \
+        not OPTIONS.disable_vabc
+    if vabc_used:
+      # TODO(zhangkelvin) Remove this once FEC on VABC is supported
+      logger.info("Virtual AB Compression enabled, disabling FEC")
+      OPTIONS.disable_fec_computation = True
+      OPTIONS.disable_verity_computation = True
   else:
     assert "ab_partitions" in OPTIONS.info_dict, \
         "META/ab_partitions.txt is required for ab_update."