staging: r8188eu: bCCKinCH14 is read-only

The variable bCCKinCH14 in struct odm_rf_cal is never set. It stays
at its default value 0. Remove bCCKinCH14 from struct odm_rf_cal and
remove related dead code.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220216194038.6762-3-straube.linux@gmail.com


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