zeppelin: cyanogen_zeppelin.mk: sysctl.conf is not being copied

The file system/etc/sysctl.conf is ending up empty.  It does not contain the contents of device/motorola/zeppelin/sysctl.conf like it should.  A user on the M3 forum suggested this change.  Please approve this change if it will lead to the sysctl.conf file being copied correctly.
Submitted on behalf of a third-party: User 'epinter' from the M3 forums.

Change-Id: Ia1222f10138b8dd06662cddc25a8168f21d61f50
1 file changed