hw/arm: Express dependencies of the microbit / nrf51 machine with Kconfig

Add Kconfig dependencies for the NRF51 / microbit machine.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
3 files changed