staging: wilc1000: remove wilc_wlan.c included in wilc_wfi_cfgoperations.c

This patch removes "wilc_wlan.c" from the wilc_wfi_cfgoperation.c file and
adds wilc_wlan.o into Makefile to compile it because there is few benefits.
This patch also adds "wilc_wfi_netdevice.h" in the wilc_wlan.c file to avoid
the compile errors.

Signed-off-by: Tony Cho <tony.cho@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/wilc1000/Makefile b/drivers/staging/wilc1000/Makefile
index f495061..64c2f1b 100644
--- a/drivers/staging/wilc1000/Makefile
+++ b/drivers/staging/wilc1000/Makefile
@@ -21,7 +21,8 @@
 wilc1000-objs := wilc_wfi_cfgoperations.o linux_wlan.o linux_mon.o \
 			wilc_msgqueue.o \
 			coreconfigurator.o host_interface.o \
-			wilc_sdio.o wilc_spi.o wilc_wlan_cfg.o wilc_debugfs.o
+			wilc_sdio.o wilc_spi.o wilc_wlan_cfg.o wilc_debugfs.o \
+			wilc_wlan.o
 
 wilc1000-$(CONFIG_WILC1000_SDIO) += linux_wlan_sdio.o
 wilc1000-$(CONFIG_WILC1000_SPI) += linux_wlan_spi.o