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/board/gateworks/gw_ventana/gsc.c b/board/gateworks/gw_ventana/gsc.c
index 4179f0f..bcb6bca 100644
--- a/board/gateworks/gw_ventana/gsc.c
+++ b/board/gateworks/gw_ventana/gsc.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <command.h>
 #include <log.h>
+#include <linux/delay.h>
 #include <linux/errno.h>
 #include <common.h>
 #include <i2c.h>