zenfone7: Allow hal_power_default to write to the /dev/cpu_dma_latency

W NodeLooperThrea: type=1400 audit(0.0:514): avc:  denied  { write } for  name="cpu_dma_latency" dev="tmpfs" ino=2246 scontext=u:r:hal_power_default:s0 tcontext=u:object_r:vendor_latency_device:s0 tclass=chr_file permissive=0

Change-Id: Ifc0af5d648ad1e2b84dd2639676f8bd90cd2e195
Signed-off-by: micky387 <mickaelsaibi@free.fr>
diff --git a/sepolicy/vendor/hal_power_default.te b/sepolicy/vendor/hal_power_default.te
index 1726086..2e78773 100644
--- a/sepolicy/vendor/hal_power_default.te
+++ b/sepolicy/vendor/hal_power_default.te
@@ -1 +1,4 @@
 allow hal_power_default vendor_proc_evt:file rw_file_perms;
+
+# To do powerhint on nodes defined in powerhint.json
+allow hal_power_default vendor_latency_device:chr_file w_file_perms;