OSTree: Remove kernel console cmdline parameter

The yaml file specifies an incorrect command line parameter for the
OSTree u-boot images.
The parameter is incorrect for Renesas R-car, and could be different
in any other u-boot board.
The serial port to use as console is defined in the dtb.

Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.co.uk>
Reviewed-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D7752

apertis-ostree-image-uboot.yaml

@@ -9,7 +9,7 @@
 {{ $branch := or .branch (printf "%s/%s/%s-%s/%s" $osname $suite $architecture $board $type) }}
 {{ $ostree := or .ostree "repo" }}
 
-{{ $cmdline := or .cmdline "console=tty0 console=ttyS0,115200n8 rootwait rw quiet splash plymouth.ignore-serial-consoles" }}
+{{ $cmdline := or .cmdline "rootwait rw quiet splash plymouth.ignore-serial-consoles" }}
 
 architecture: {{ $architecture }}