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_loader/efi_variable.c b/lib/efi_loader/efi_variable.c
index e888c52..f3533f4 100644
--- a/lib/efi_loader/efi_variable.c
+++ b/lib/efi_loader/efi_variable.c
@@ -16,7 +16,7 @@
 #include <malloc.h>
 #include <rtc.h>
 #include <search.h>
-#include <uuid.h>
+#include <u-boot/uuid.h>
 #include <crypto/pkcs7_parser.h>
 #include <linux/compat.h>
 #include <u-boot/crc.h>