manifests/default.xml: Update source revision on meta-seco-imx.
Add a new partition scheme in wic input file for seco-imx8mm-c61.

grub/oniro-grub-bootconf.bb: Include rauc-conf.inc. Retrieve the
values ​​of SERIAL_CONSOLES, RAUC_SLOT_A, RAUC_SLOT_B to pass them to
grub.cfg file.

rauc: Move machines specific configurations into
dedicated include file (rauc-conf.inc) for meta-data sharing.

grub/files/grub.cfg: Use SERIAL_CONSOLES, RAUC_SLOT_A, RAUC_SLOT_B
variables instead of hard-coding their values, to be suitable for
different target machines.

sysota/sysota_git.bb: Add seco-imx8mm-c61 model and bootloader type.

bundles/oniro-bundle-base.bb Add seco-imx8mm-c61 bundle compatibility string.
Signed-off-by: Natalia Kovalenko <waykovalenko@gmail.com>