mwl8787: remove cmd/data_sent variables

Unused except for debug print.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
mwl8787: drop more unused variables

Signed-off-by: Bob Copeland <me@bobcopeland.com>
mwl8787: allow overriding the perm addr with a modparam

Seems needed for some tablets.

Signed-off-by: Bob Copeland <me@bobcopeland.com>