mcb: remove unused struct 'mcb_parse_priv'

'mcb_parse_priv' has been unused since the initial
commit 3764e82e ("drivers: Introduce MEN Chameleon Bus").

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Johannes Thumshirn <jth@kernel.org>
Link: https://lore.kernel.org/r/20240624090104.12871-2-jth@kernel.org


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