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/efi/efi_app.c b/lib/efi/efi_app.c
index 88332c3..9b94a93 100644
--- a/lib/efi/efi_app.c
+++ b/lib/efi/efi_app.c
@@ -17,7 +17,7 @@
 #include <init.h>
 #include <malloc.h>
 #include <sysreset.h>
-#include <uuid.h>
+#include <u-boot/uuid.h>
 #include <asm/global_data.h>
 #include <linux/err.h>
 #include <linux/types.h>