The genmai board now boots using DT and multiplatform kernel with the
same feature set as the legacy board. Remove the legacy board file and
the board Kconfig option.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Wolfram Sang <wsa@sang-engineering.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>