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/usb/gadget/dwc2_udc_otg_phy.c b/drivers/usb/gadget/dwc2_udc_otg_phy.c
index c4338af..7f8e956 100644
--- a/drivers/usb/gadget/dwc2_udc_otg_phy.c
+++ b/drivers/usb/gadget/dwc2_udc_otg_phy.c
@@ -18,6 +18,7 @@
  */
 
 #include <common.h>
+#include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/list.h>
 #include <malloc.h>