staging: r8188eu: DM_PriCCA is set but never used

The field DM_PriCCA of struct odm_dm_struct is set but never used.
Remove it and remove related dead code.

Acked-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20211228101120.9120-2-straube.linux@gmail.com


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