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/firmware/firmware-zynqmp.c b/drivers/firmware/firmware-zynqmp.c
index c376425..4774645 100644
--- a/drivers/firmware/firmware-zynqmp.c
+++ b/drivers/firmware/firmware-zynqmp.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <dm.h>
 #include <zynqmp_firmware.h>
+#include <asm/cache.h>
 
 #if defined(CONFIG_ZYNQMP_IPI)
 #include <mailbox.h>