Remove file_contexts.bin from non-A/B OTA package.

This entry only exists in non-A/B full OTA path. However, this file has
never been loaded by recovery - recovery was only reading the one from
the recovery image (which also has been removed by a recent change in
[1]).

[1]: commit e35926e1aff2e6b9b54656bd59c8178e295a1b7e in
platform/bootable/recovery.

Bug: 63538434
Test: `m dist` on angler. file_contexts.bin is gone from full OTA
      package. Sideloading the generated full OTA on angler.
Change-Id: Iec2e2d36599fa1ed499516a3e74f06cd36ade494

tools/releasetools/ota_from_target_files.py

@@ -470,11 +470,6 @@ else if get_stage("%(bcb_dev)s") == "3/3" then
   if HasVendorPartition(input_zip):
     system_progress -= 0.1
 
-  # Place a copy of file_contexts.bin into the OTA package which will be used
-  # by the recovery program.
-  if "selinux_fc" in OPTIONS.info_dict:
-    WritePolicyConfig(OPTIONS.info_dict["selinux_fc"], output_zip)
-
   recovery_mount_options = OPTIONS.info_dict.get("recovery_mount_options")
 
   script.ShowProgress(system_progress, 0)
@@ -540,10 +535,6 @@ endif;
   WriteMetadata(metadata, output_zip)
 
 
-def WritePolicyConfig(file_name, output_zip):
-  common.ZipWrite(output_zip, file_name, os.path.basename(file_name))
-
-
 def WriteMetadata(metadata, output_zip):
   value = "".join(["%s=%s\n" % kv for kv in sorted(metadata.iteritems())])
   common.ZipWriteStr(output_zip, METADATA_NAME, value,