ARM: at91/dt: add at91rm9200 PQFP package version

The PQFP version have only 3 gpio banks (A, B & C).

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
[nicolas.ferre@atmel.com: correct typo in "status" property]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>