recovery: symlink /sbin for script compatibility

Change-Id: I6548d65c1e6f775d2d1931864ebf7830d701fbaf
diff --git a/etc/init.rc b/etc/init.rc
index 3eacac9..d94d0f6 100644
--- a/etc/init.rc
+++ b/etc/init.rc
@@ -23,6 +23,8 @@
 
     symlink /system/bin /bin
     symlink /system/etc /etc
+    rmdir /sbin
+    symlink /system/bin /sbin
 
     mkdir /sdcard
     mkdir /system