dhcp: Rename bbappend to match version in oe-core "dylan"

[GF-5571] CCC: Upgrade to Yocto 1.4 Dylan

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: I796f62aa3e0ade65d087aa4f7a9b2ba71783e87a
Reviewed-on: https://g2g.palm.com/2206
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>