net: dsa: Validate hardware support for MST

When joining a bridge where MST is enabled, we validate that the
proper offloading support is in place, otherwise we fallback to
software bridging.

When then mode is changed on a bridge in which we are members, we
refuse the change if offloading is not supported.

At the moment we only check for configurable learning, but this will
be further restricted as we support more MST related switchdev events.

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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