util-linux: Remove bbappend, resolved in oe-core

* util-linux in oe-core has newer PV, so we can remove PR_append too

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@palm.com>
Change-Id: Ia9340e2dc1bad67bbb2f69f92f49f76066129c2d