sunxi: a10-LIME set the cpu clock at boot to 912MHz

following kernel patches to reduce the cpu clock to 912MHz due to
reported instability at 1008MHz, select 912MHz as the boot speed
for the a10-lime

Signed-off-by: Iain Paton <ipaton0@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>