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/cmd/usb_mass_storage.c b/cmd/usb_mass_storage.c
index a117ab2..d565635 100644
--- a/cmd/usb_mass_storage.c
+++ b/cmd/usb_mass_storage.c
@@ -17,6 +17,7 @@
 #include <usb.h>
 #include <usb_mass_storage.h>
 #include <watchdog.h>
+#include <linux/delay.h>
 
 static int ums_read_sector(struct ums *ums_dev,
 			   ulong start, lbaint_t blkcnt, void *buf)