staging: wilc1000: merge drv_handle and operation_mode wids

staging: wilc1000: merge drv_handle and operation_mode wids

wilc_set_wfi_drv_handler and wilc_set_operation_mode sends the same
parameters to the FW, so it's better to combine them together.

Kept wilc_set_wfi_drv_handler implementation since it sends all the
required parameters, and renamed it to wilc_set_operation_mode to be
more descriptive.

Signed-off-by: Adham Abozaeid <adham.abozaeid@microchip.com>
Link: https://lore.kernel.org/r/20190801200909.12605-2-adham.abozaeid@microchip.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>