webos-image: Update layer pins for 2014-04-25

meta-webos as of 2014-04-25 10:02:14 -0700

523961d icecc: Exclude nss from building with icecc
2120d65 icecc: Exclude linux-libc-headers from building with icecc
3cfc627 icecc: Exclude binutils from building with icecc

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

Change-Id: I9f8fdd8a59a68067fb32552c3ad59bec0a8bfbf7
Reviewed-on: https://g2g.palm.com/5437
Reviewed-by: DCO Verification
Build: Susan Montooth <susan.montooth@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>