common: Drop net.h from common header

Move this header out of the common header. Network support is used in
quite a few places but it still does not warrant blanket inclusion.

Note that this net.h header itself has quite a lot in it. It could be
split into the driver-mode support, functions, structures, checksumming,
etc.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index 3d658e6..eed61cd 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -11,6 +11,7 @@
 #include <stdio_dev.h>
 #include <video.h>
 #include <video_console.h>
+#include <asm/cache.h>
 #include <dm/lists.h>
 #include <dm/device-internal.h>
 #include <dm/uclass-internal.h>