configs: rockchip: rock960: drop options for non-existent HW

The Rock960 doesn't contain SPI flash so drop related config options.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
1 file changed