webos-preferred-providers: Remove update-rc.d from images

:Release Notes:
With upstart as init manager we don't need update-rc.d to manager
sysvinit scripts.

:Detailed Notes:
Remove PREFERRED_PROVIDER_udev, we already have oe-core revision which
includes this.

:Testing Performed:
Only build tested and verified in buildhistory.

:QA Notes:
update-rc.d is not longer installed, but because we're not using
sysvinit scripts it shouldn't cause any functional change

:Issues Addressed:
[GF-2169] Remove extraneous open-source packages

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>

Change-Id: I07bd472aa33c0d3ac736b4b6c275ffa76d40b554
Reviewed-on: https://g2g.palm.com/4027
Reviewed-by: DCO Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Ed Chejlava <ed.chejlava@lge.com>
Reviewed-by: Herb Kuta <herb.kuta@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>