ARM: at91: removal of CAP9 SoC family

Atmel CAP9 family is not maintained well and products may be
difficult to find now. It will allow to save workforce and
remove LOC during current cleanup process.

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