AT91: at91sam9m10g45ek: use the right machine id

Today the board use 2 machines id AT91SAM9G45EKES and AT91SAM9M10G45EK
now will use only AT91SAM9M10G45EK.

The other boards revision will be specified via system_rev.

for 9g45ekes, m10g45ekes and m10g45ek boards and revisions

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