Add a /bin symlink for consistency.

Bug: http://b/63142920
Test: builds
Change-Id: I1f96935daca4d79f753e172067e07f8e27ea819e
diff --git a/etc/init.rc b/etc/init.rc
index d8121cc..0fc6c4c 100644
--- a/etc/init.rc
+++ b/etc/init.rc
@@ -11,6 +11,7 @@
     export ANDROID_DATA /data
     export EXTERNAL_STORAGE /sdcard
 
+    symlink /system/bin /bin
     symlink /system/etc /etc
 
     mount cgroup none /acct cpuacct