linux-yocto does not currently ship a 6.19 recipe, so add a
meta-arm-bsp linux-yocto_6.19.bb that tracks linux-yocto-dev v6.19/base.
Pin SRCREV_machine to fixed revision to keep builds reproducible.
Update Corstone-1000 to prefer linux-yocto 6.19 and align
the user guide pointers accordingly.
Signed-off-by: Michael Safwat <michael.safwat@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>
Michael Safwat