webos-image: Update layer pins for 2013-04-19

meta-webos for 2013-04-19 17:46:34 -0700

186e111 webos-image: pmloglib=25,v2.2.0
a4686cd webos-image: nyx-lib=66, nyx-modules=86

Open-webOS-DCO-1.0-Signed-off-by: Susan Montooth <susan.montooth@lge.com>