Grant GPU access to ephemeral_app

... which will be needed for Cuttlefish with Minigbm
Gralloc 4.

Bug: b/146515640
Test: cts -m CtsGraphicsTestCases -t AImageDecoderTest
Change-Id: I6497aeb230ea9076afd55a2704ff9117ee7dc1ef
diff --git a/shared/sepolicy/vendor/ephemeral_app.te b/shared/sepolicy/vendor/ephemeral_app.te
new file mode 100644
index 0000000..92fcef6
--- /dev/null
+++ b/shared/sepolicy/vendor/ephemeral_app.te
@@ -0,0 +1 @@
+gpu_access(ephemeral_app)