Allow virtualizationmanager to read AVF debug policy

virtualizationmanager may handle some AVF debug policies for unproteted VM.

Bug: 243630590
Test: Run unprotected VM with/without ramdump
Change-Id: I2941761efe230a9925d1146f8ac55b50e984a4e9
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 6fa98ea..77e3954 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -145,6 +145,7 @@
 genfscon sysfs /devices/virtual/net             u:object_r:sysfs_net:s0
 genfscon sysfs /devices/virtual/switch          u:object_r:sysfs_switch:s0
 genfscon sysfs /devices/virtual/wakeup          u:object_r:sysfs_wakeup:s0
+genfscon sysfs /firmware/devicetree/base/avf u:object_r:sysfs_dt_avf:s0
 genfscon sysfs /firmware/devicetree/base/firmware/android u:object_r:sysfs_dt_firmware_android:s0
 genfscon sysfs /fs/ext4/features                  u:object_r:sysfs_fs_ext4_features:s0
 genfscon sysfs /fs/f2fs                           u:object_r:sysfs_fs_f2fs:s0