sepolicy: Add the dmabuf system-uncached heap

This should match policy for the system heap as they both map to
the ION system heap with the ION_FLAG_CACHED flag on or off.

Change-Id: Ib2929b84a2f8092adcf2f874ad6ccdfe068fe6dc
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/private/file_contexts b/private/file_contexts
index 633a6ce..79b16b1 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -94,6 +94,7 @@
 /dev/console		u:object_r:console_device:s0
 /dev/cpu_variant:.*     u:object_r:dev_cpu_variant:s0
 /dev/dma_heap/system    u:object_r:dmabuf_system_heap_device:s0
+/dev/dma_heap/system-uncached    u:object_r:dmabuf_system_heap_device:s0
 /dev/dm-user(/.*)?	u:object_r:dm_user_device:s0
 /dev/device-mapper	u:object_r:dm_device:s0
 /dev/eac		u:object_r:audio_device:s0