staging: wilc1000: removed enum typedef BUS_ACQUIRE_T

This patch removes enum typedef BUS_ACQUIRE_T and define
enum bus_acquire to use instead of typedef.

checkpatch.pl not to add new typedef warning is fixed with this patch.

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