Update weston-ini-conf package use

Update weston-ini-conf package use

The rework of the weston-ini-conf recipe in meta-agl new means that
there are separate weston-ini-conf and weston-ini-conf-landscape
packages for portrait versus landscape mode, so update use in the
demo image packagegroups to use the appropriate one explicitly.
The previous dependency in packagegroup-agl-graphical-weston has been
removed since weston-init now has a dependency on the new "weston-ini"
runtime (i.e. explicit RPROVIDES) dependency.  Note, however, that
explicitly pulling weston-ini-conf or weston-ini-conf-landscape into
images is recommended as opposed to relying on PREFERRED_RPROVIDER.

Bug-AGL: SPEC-3745

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ia37d61c5684a06755d2761850394e5f887f14a4a