Switch the sam460ex board to directly creating and configuring the
UIC, rather than doing it via the old ppcuic_init() helper function.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20210108171212.16500-2-peter.maydell@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>