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/crypto/fsl/jobdesc.c b/drivers/crypto/fsl/jobdesc.c
index 637ef29..2f35e0c 100644
--- a/drivers/crypto/fsl/jobdesc.c
+++ b/drivers/crypto/fsl/jobdesc.c
@@ -13,6 +13,7 @@
 #include "desc_constr.h"
 #include "jobdesc.h"
 #include "rsa_caam.h"
+#include <asm/cache.h>
 
 #if defined(CONFIG_MX6) || defined(CONFIG_MX7)
 /*!