include: export uuid.h

Move this header to include/u-boot/ so that it can be used by external
tools.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/net/bootp.c b/net/bootp.c
index 9dfb507..512ab2e 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -15,7 +15,7 @@
 #include <log.h>
 #include <net.h>
 #include <rand.h>
-#include <uuid.h>
+#include <u-boot/uuid.h>
 #include <linux/delay.h>
 #include <net/tftp.h>
 #include "bootp.h"