staging: wilc1000: remove unused functions

This patch removes unused functions.
 - drivers/staging/wilc1000/linux_mon.c : WILC_WFI_mon_setup
 - drivers/staging/wilc1000/wilc_sdio.o : sdio_set_func0_csa_address_byte0

Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>