Quite a while has passed since we last updated U-Boot for e500. This patch
bumps it to the last released version 2019.01 to make sure users don't feel
like they're using out of date software.

Signed-off-by: Alexander Graf <agraf@csgraf.de>
Message-Id: <20190304103930.16319-1-agraf@csgraf.de>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>