Revert "Add sign_sepolicy_path for a binary to sign sepolicy.apex."

This reverts commit e0a977affd.

Test: atest --host releasetools_test
Bug: 297794885
Change-Id: I951277e4aa3ae1f90474a1f7a036fc8693453c53

tools/releasetools/test_sign_apex.py

@@ -58,21 +58,6 @@ class SignApexTest(test_utils.ReleaseToolsTestCase):
         apk_keys)
     self.assertTrue(os.path.exists(signed_test_apex))
 
-  @test_utils.SkipIfExternalToolsUnavailable()
-  def test_SignSepolicyApex(self):
-    test_apex = os.path.join(self.testdata_dir, 'sepolicy.apex')
-    payload_key = os.path.join(self.testdata_dir, 'testkey_RSA4096.key')
-    container_key = os.path.join(self.testdata_dir, 'testkey')
-    apk_keys = {'SEPolicy-33.zip': os.path.join(self.testdata_dir, 'testkey')}
-    signed_test_apex = sign_apex.SignApexFile(
-        'avbtool',
-        test_apex,
-        payload_key,
-        container_key,
-        False,
-        None)
-    self.assertTrue(os.path.exists(signed_test_apex))
-
   @test_utils.SkipIfExternalToolsUnavailable()
   def test_SignCompressedApexFile(self):
     apex = os.path.join(test_utils.get_current_dir(), 'com.android.apex.compressed.v1.capex')