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/arch/microblaze/cpu/cache.c b/arch/microblaze/cpu/cache.c
index 02f66f9..aa832d6 100644
--- a/arch/microblaze/cpu/cache.c
+++ b/arch/microblaze/cpu/cache.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <cpu_func.h>
 #include <asm/asm.h>
+#include <asm/cache.h>
 
 int dcache_status(void)
 {
diff --git a/arch/microblaze/lib/bootm.c b/arch/microblaze/lib/bootm.c
index 2d6a41b..87d2d6e 100644
--- a/arch/microblaze/lib/bootm.c
+++ b/arch/microblaze/lib/bootm.c
@@ -14,6 +14,7 @@
 #include <fdt_support.h>
 #include <hang.h>
 #include <image.h>
+#include <asm/cache.h>
 #include <u-boot/zlib.h>
 #include <asm/byteorder.h>