meta-agl-core: Update weston-ini-conf landscape support

meta-agl-core: Update weston-ini-conf landscape support

Rework to change the weston-ini-conf-landscape configuration to be
no rotation, and add a new weston-ini-conf-landscape-inverted
configuration with the 180 degree rotation that was being used as
landscape before for the cluster demo (which has an inverted screen
installation).

Bug-AGL: SPEC-3791

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ia5179b26b30b484157e4d911ee07fe08f02415d8
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25993
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
(cherry picked from commit 48fd4407babad2df5dba0aeb57c832a9ab531c0d)
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/26063