wireless-regdb: allow 320MHz channel width for Russia

The entry was added before 11be (and thus 320MHz) was a thing,
and there is no actual legal restriction on channel width, so
update it to allow 320MHz channels.

Signed-off-by: K900 <me@0upti.me>
Reviewed-by: Louis Kotze <loukot@gmail.com>
Link: https://patch.msgid.link/20260428093058.3672383-1-me@0upti.me
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>