Add /dev permissions to dynamic sensor README.md .

Bug: 228879057
Test: Verified in gitiles.
Change-Id: If82a5bf302cb68a2c5b486006e4679fbfc8ee545
diff --git a/modules/sensors/dynamic_sensor/README.md b/modules/sensors/dynamic_sensor/README.md
index 49e541e..5d5bd6d 100644
--- a/modules/sensors/dynamic_sensor/README.md
+++ b/modules/sensors/dynamic_sensor/README.md
@@ -62,6 +62,7 @@
 +get_prop(hal_sensors_default, vendor_dynamic_sensor_prop)
 +
 +# Allow access to raw HID devices for dynamic sensors.
++allow hal_sensors_default device:dir r_dir_perms;
 +allow hal_sensors_default hidraw_device:chr_file rw_file_perms;
 +
  #