Update the Atmel SoC entry for SAMA5D2 with all the product variants. Add the
datasheet web link, now that it's available, for instant access to full product
documentation.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>