sanders: Switch to TARGET_FS_CONFIG_GEN for fs_config

* On Oreo, android_filesystem_config is generated by a python script
   that provides a nice way to add AIDs without overriding any header.
 * Switch AID values from 9xxx to 5xxx since accepted ranges
   for OEMs are only 5000-5999 and 2900-2999
 * Remove fs_config_files since it is already in embedded.mk

fs_config/file_caps.txt

@@ -0,0 +1,32 @@
+#
+# Copyright (C) 2017 The LineageOS Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+[system/bin/imsdatadaemon]
+user: AID_SYSTEM
+group: AID_SYSTEM
+mode: 0755
+caps: NET_BIND_SERVICE
+
+[system/bin/ims_rtp_daemon]
+user: AID_SYSTEM
+group: AID_RADIO
+mode: 0755
+caps: NET_BIND_SERVICE
+
+[system/bin/pm-service]
+user: AID_SYSTEM
+group: AID_SYSTEM
+mode: 0755
+caps: NET_BIND_SERVICE