board/orangepi*: update links in readme files
Old links are no longer working, so use new links instead.
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 9584c8073a3b0d7453683d32bfafa0eb2c856a64)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>