Allow system_server access to hidraw devices.

This allows AccessibilityManagerService in system_server to
interact with a HID-supported Braille Display.

Bug: 303522222
Test: ls -z /dev/hidraw0
Test: plat_file_contexts_test
Test: Open FileInputStream and FileOutputStream on this device
      path from AccessibilityManagerService
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:67a63cc046769759aa43cf1653f11e57c55cd1db)
Merged-In: I2982e907bd2a70c1e4e8161647d6efd65110b99c
Change-Id: I2982e907bd2a70c1e4e8161647d6efd65110b99c
diff --git a/private/system_server.te b/private/system_server.te
index 8c26cc7..bab31ae 100644
--- a/private/system_server.te
+++ b/private/system_server.te
@@ -480,6 +480,8 @@
 allow system_server rtc_device:chr_file rw_file_perms;
 allow system_server audio_device:dir r_dir_perms;
 allow system_server uhid_device:chr_file rw_file_perms;
+allow system_server hidraw_device:dir r_dir_perms;
+allow system_server hidraw_device:chr_file rw_file_perms;
 
 # write access to ALSA interfaces (/dev/snd/*) needed for MIDI
 allow system_server audio_device:chr_file rw_file_perms;