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/lib/uuid.c b/lib/uuid.c
index 6fdae79..11b86ff 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -29,7 +29,7 @@
 #include <linux/types.h>
 #include <errno.h>
 #include <linux/kconfig.h>
-#include <uuid.h>
+#include <u-boot/uuid.h>
 #include <u-boot/sha1.h>
 
 #ifdef USE_HOSTCC