staging: wilc1000: refactor wilc_hif_set_cfg() to avoid deferred handling

Avoid handling configuration params wid command in deferred approach.
Instead of posting to workqueue now handle directly from the caller
context. Reduce the size of wid array from 32 to 4 as maximum only 4 wid
used at a time.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>