emulator: allow /dev/qemu_pipe access

This patch is necessary to allow normal applications to access the
special /dev/qemu_pipe device file at runtime. This is used to provide
a high-speed communication channel with the emulator.

Needed by OpenGLES emulation.

Change-Id: Ic266bdcc4fd069d2b4355e6ea81723296a1a21d1
diff --git a/rootdir/ueventd.rc b/rootdir/ueventd.rc
index b534669..254a1cf 100644
--- a/rootdir/ueventd.rc
+++ b/rootdir/ueventd.rc
@@ -65,6 +65,7 @@
 /dev/snd/mixer            0660   system     audio
 /dev/smd0                 0640   radio      radio
 /dev/qemu_trace           0666   system     system
+/dev/qemu_pipe            0666   system     system
 /dev/qmi                  0640   radio      radio
 /dev/qmi0                 0640   radio      radio
 /dev/qmi1                 0640   radio      radio