use correct at91rm9200 register name in m501sk board

This fixes a naming bug for at91rm9200 lowlevel init code:
NOR boot flash is on chipselect 0, not chipselect 2.  This
makes code use the register name from chip datasheets.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
1 file changed