common: Drop linux/delay.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/natsemi.c b/drivers/net/natsemi.c
index 86f6898..bf6fa8f 100644
--- a/drivers/net/natsemi.c
+++ b/drivers/net/natsemi.c
@@ -56,6 +56,7 @@
 #include <netdev.h>
 #include <asm/io.h>
 #include <pci.h>
+#include <linux/delay.h>
 
 /* defines */
 #define EEPROM_SIZE 0xb /*12 16-bit chunks, or 24 bytes*/