staging: wilc1000: remove unused variables

Variable g_num_total_switches is never used so just remove it.
gastrWIDs is also not used because g_num_total_switches is deleted.
Remove gastrWIDs also.

Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>