audio: allow audio hal to access acd-mel_processor

The /dev/acd-mel_processor is for the SoundDose
feature

Bug: 244133608
Test: build pass
Change-Id: I1f9c914c9a2d8cc86a8f1c643a9bbd73deb221d4
Signed-off-by: Carter Hsu <carterhsu@google.com>
diff --git a/aoc/sepolicy/file_contexts b/aoc/sepolicy/file_contexts
index 65f4aa5..fef8d73 100644
--- a/aoc/sepolicy/file_contexts
+++ b/aoc/sepolicy/file_contexts
@@ -22,6 +22,7 @@
 /dev/aoc                            u:object_r:aoc_device:s0
 /dev/acd-audio_ap_offload_rx        u:object_r:aoc_device:s0
 /dev/acd-audio_ap_offload_tx        u:object_r:aoc_device:s0
+/dev/acd-mel_processor              u:object_r:aoc_device:s0
 
 # AoC vendor binaries
 /vendor/bin/aocd                    u:object_r:aocd_exec:s0