staging: brcm80211: remove brcms_c_get_par and set_par functions

The source main.c provided an interface function that handled several
things demultiplexing on given identifier. This interface has been
replaced by separate functions to make it more straightforward.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>