staging: r8188eu: remove struct rt_channel_plan_2g

The structures rt_channel_plan and rt_channel_plan_2g are identical.
Keep rt_channel_plan and remove rt_channel_plan_2g.

Acked-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220102131141.12310-3-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>