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/cmd/x86/hob.c b/cmd/x86/hob.c
index 2dd3080..d3713ce 100644
--- a/cmd/x86/hob.c
+++ b/cmd/x86/hob.c
@@ -5,7 +5,7 @@
 
 #include <command.h>
 #include <efi.h>
-#include <uuid.h>
+#include <u-boot/uuid.h>
 #include <asm/global_data.h>
 #include <asm/hob.h>
 #include <asm/fsp/fsp_hob.h>