audio: add file_contexts of /dev/acd-mc_headpos

Bug: 307842941
Test: mm
Change-Id: Id4210c309d4a86e81a510dacb83b23396c5a327b
diff --git a/aoc/sepolicy/file_contexts b/aoc/sepolicy/file_contexts
index 617b7b9..c43bc75 100644
--- a/aoc/sepolicy/file_contexts
+++ b/aoc/sepolicy/file_contexts
@@ -28,6 +28,7 @@
 /dev/acd-audio_ap_offload_tx        u:object_r:aoc_device:s0
 /dev/acd-mel_processor              u:object_r:aoc_device:s0
 /dev/acd-aocx_control               u:object_r:aoc_device:s0
+/dev/acd-mc_headpos                 u:object_r:aoc_device:s0
 
 # AoC vendor binaries
 /vendor/bin/aocd                    u:object_r:aocd_exec:s0