1. Support the dma mode for andes_atcspi200
and use board adp_xc7k_ae350 for testing.
2. Refine the function mechanism.
Signed-off-by: Kevin Wang <kevinwang821020@google.com>
1. Remove the redundant code.
2. Use sys_set_bits and sys_clear_bits instead of customized MACRO.
Signed-off-by: Kevin Wang <kevinwang821020@google.com>