ARM: shmobile: lager dts: Drop console= bootargs parameter

Since commit FIXME ("ARM: shmobile: lager: Remove legacy board support"),
lager is restricted to booting from DT, so chosen/stdout-path is always
used, and we can drop the "console=" parameter from chosen/bootargs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>