staging: wilc1000: wilc_wfi_netdevice.h: remove unused variables

This patch removes unused variable already_claim and hWILCWFIDrv_2.

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>