MAINTAINERS: downgrade Ethernet NIC drivers without CI reporting

MAINTAINERS: downgrade Ethernet NIC drivers without CI reporting

Per previous change downgrade all NIC drivers (discrete, embedded,
SoC components, virtual) which don't report test results to CI
from Supported to Maintained.

Also include all components or building blocks of NIC drivers
(separate entries for "shared" code, subsystem support like PTP
or entries for specific offloads etc.)

Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://patch.msgid.link/20250111024359.3678956-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>