staging: wilc1000: Remove header file

Remove duplicate header file. Found using includecheck.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/wilc1000/linux_wlan.c b/drivers/staging/wilc1000/linux_wlan.c
index eafde6f..bfa754b 100644
--- a/drivers/staging/wilc1000/linux_wlan.c
+++ b/drivers/staging/wilc1000/linux_wlan.c
@@ -12,7 +12,6 @@
 
 #include <linux/kthread.h>
 #include <linux/firmware.h>
-#include <linux/delay.h>
 
 #include <linux/init.h>
 #include <linux/netdevice.h>