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/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
index 4d0dc33..886299a 100644
--- a/drivers/mmc/omap_hsmmc.c
+++ b/drivers/mmc/omap_hsmmc.c
@@ -33,6 +33,7 @@
 #if defined(CONFIG_OMAP54XX) || defined(CONFIG_OMAP44XX)
 #include <palmas.h>
 #endif
+#include <asm/cache.h>
 #include <asm/io.h>
 #include <asm/arch/mmc_host_def.h>
 #ifdef CONFIG_OMAP54XX