kernel: Include RHEL Ecosystem message

Bugzilla: https://bugzilla.redhat.com/2033650
Upstream Status: RHEL only (discussions ongoing to include this in ARK)

After discussions with the BU, EPM, and other teams, we have decided to
include this message in RHEL9:

"The list of certified hardware and cloud instances for Red Hat Enterprise Linux 9 can be viewed at the Red Hat Ecosystem Catalog, https://catalog.redhat.com."

Signed-off-by: Prarit Bhargava prarit@redhat.com