staging: wilc1000: remove do-nothing ifdef statement

This patch removes do-nothing ifdef, else statement and add ifdef WILC_SDIO
for disable_sdio_interrupt().

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>