boot/uboot: add hash file

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

boot/uboot/uboot.hash

@@ -0,0 +1,2 @@
+# Locally computed:
+sha256	0a1a70df586655f527befa6f12e184e96ed61b126e5a567382321b17200f5d60  u-boot-2015.04.tar.bz2