at91/sama7: Remove config options build as module

at91/sama7: Remove config options build as module

Remove the configuration options which are building modules for the sub
target configuration.

These kernel modules are not packaged. Kernel options should only be
build as a module when they are selected by a kmod package and not by
setting them to =m in the target kernel configuration.

Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>