Don't use a separate tmpfs mount for /tmp and /run

We don't need a separate tmpfs on /tmp and /run, as we're already
providing a completely in-ram filesystem.

This requires us to override fstab, and device table - these are just
the buildroot standard ones, but with /tmp and /run removed.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
diff --git a/openpower/device_table.txt b/openpower/device_table.txt
new file mode 100644
index 0000000..450aab6
--- /dev/null
+++ b/openpower/device_table.txt
@@ -0,0 +1,23 @@
+# See package/makedevs/README for details
+#
+# This device table is used to assign proper ownership and permissions
+# on various files. It doesn't create any device file, as it is used
+# in both static device configurations (where /dev/ is static) and in
+# dynamic configurations (where devtmpfs, mdev or udev are used).
+#
+# <name>				<type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
+/dev					d	755	0	0	-	-	-	-	-
+/etc					d	755	0	0	-	-	-	-	-
+/root					d	700	0	0	-	-	-	-	-
+/var/www				d	755	33	33	-	-	-	-	-
+/etc/random-seed			f	600	0	0	-	-	-	-	-
+/etc/shadow				f	600	0	0	-	-	-	-	-
+/etc/passwd				f	644	0	0	-	-	-	-	-
+/etc/network/if-up.d			d	755	0	0	-	-	-	-	-
+/etc/network/if-pre-up.d		d	755	0	0	-	-	-	-	-
+/etc/network/if-post-up.d		d	755	0	0	-	-	-	-	-
+/etc/network/if-down.d			d	755	0	0	-	-	-	-	-
+/etc/network/if-pre-down.d		d	755	0	0	-	-	-	-	-
+/etc/network/if-post-down.d		d	755	0	0	-	-	-	-	-
+# uncomment this to allow starting x as non-root
+#/usr/X11R6/bin/Xfbdev		     	f	4755	0	0	-	-	-	-	-