iproute2: Drop bbappend, not needed with oe-core "dylan"

* iptables were added to DEPENDS in
  https://github.com/openembedded/oe-core/commit/50b37d4bd90e22c6d129836f896c4a6de66c003f

[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: I712b0e786dfc19187f61d3f5dd64b631863ab49f
Reviewed-on: https://g2g.palm.com/2211
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>