ueventd.rc: Add /dev/dma_heap/system-uncached permissions

Add permissions for dev/dma_heap/system-uncached dmabuf heap.

This should match the dmabuf system heap.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I9253d56c72d45e228539f709e76ba0862ae03d96
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index 5ed9d4d..1147315 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -47,6 +47,7 @@
 
 /dev/pmsg0                0222   root       log
 /dev/dma_heap/system      0444   system     system
+/dev/dma_heap/system-uncached      0444   system     system
 
 # kms driver for drm based gpu
 /dev/dri/*                0666   root       graphics