webos-image: Update layer pins for 2014-04-10

meta-webos as of 2014-04-10 10:04:07 -0700

f5189c4 webos-image: libpbnjson=32,v2.6.0

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

Change-Id: I29786ae8ce6e7fab6aec2775aac0247feef17628
Reviewed-on: https://g2g.palm.com/5276
Reviewed-by: DCO Verification
Build: Susan Montooth <susan.montooth@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>