omni: sepolicy: add fuse_device access for drmserver

audit(0.0:8): avc: denied { read } for path=/mnt/media_rw/F428-5197/Music/entwine/dieversity/03-someone_to_blame.ogg dev=mmcblk1p1 ino=680 scontext=u:r:drmserver:s0 tcontext=u:object_r:fuse_device:s0 tclass=file permissive=0

Change-Id: Iaa2d53b0670dfd953e8f7cacae725f9f92b19e47
diff --git a/sepolicy/drmserver.te b/sepolicy/drmserver.te
new file mode 100644
index 0000000..b7f4f3f
--- /dev/null
+++ b/sepolicy/drmserver.te
@@ -0,0 +1 @@
+allow drmserver fuse_device:file r_file_perms;