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>

test/lib/uuid.c

@@ -8,7 +8,7 @@
  *   Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
  */
 
-#include <uuid.h>
+#include <u-boot/uuid.h>
 #include <test/lib.h>
 #include <test/test.h>
 #include <test/ut.h>