staging: most: dim2: correct misleading struct type name

Correct the misleading struct type name dim_ch_state_t to dim_ch_state
since this not a typedef but a normal structure declaration.

Suggested-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: Deepak R Varma <drv@mailo.com>
Link: https://lore.kernel.org/r/Y1GDQO+06fD24Pf/@debian-BULLSEYE-live-builder-AMD64


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