staging: wilc1000: rename mac status macros and moved related #define together

Rename the mac status macro to follow the same naming style. Also move
them to keep together.

Renamed like below

>From ------------------------> To

WILC_MAC_STATUS_INIT -> MAC_STATUS_INIT
MAC_CONNECTED --------> MAC_STATUS_CONNECTED
MAC_DISCONNECTED -----> MAC_STATUS_DISCONNECTED

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