ARM: at91: add support for Cosino board series by HCE Engineering

ARM: at91: add support for Cosino board series by HCE Engineering

This patch adds the Cosino at91sam9g35 based CPU module and the
Cosino Mega 2560 extension board.

Web site: http://www.cosino.it

Signed-off-by: Rodolfo Giometti <giometti@linux.it>
[plagnioj@jcrosoft.com: added "at91-" to files, pinctrl fixed, removed unneeded stuff]
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
[nicolas.ferre@atmel.com: adapted to newer kernel, modified commit message]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>