ARM: shmobile: lager: Remove DU platform device

ARM: shmobile: lager: Remove DU platform device

Platform data support has been removed from the DU driver, drop DU
support from the legacy Lager board file. The multiplatform DT-based
Lager support should be used instead.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit 792c17cbe27484e3d9e1426005350d7a98fa25e5)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Conflicts:
	arch/arm/mach-shmobile/board-lager.c