Add SoC namespace to matrix define so we have one source less of
conflicting defines.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Here are the at91 specific files dedicated to the at91sam9g45 series. They
mimic the traditional at91 way of managing chips & boards.

The first board that embeds at91sam9g45 chip is the AT91SAM9M10G45-EK. In
the future, we will add the m10 and other boards revisions

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>