spicc: add dma and enhance features of axg/txhd/g12a/g12b.

spicc: add dma and enhance features of axg/txhd/g12a/g12b.

PD#164751: spicc: add dma and enhance features of axg/txhd/g12a/g12b.

1. fix TESTREG bits defination error;
2. fix cs-gpio error in slave setup;
3. reset fifo to avoid successive fifo error before tansfer;
4. add enhance feature of cs-preload delay control;
5. add auto io delay control;
6. add enhance feature of tt/ti delay control;
7. fix clk error which occurred certainly when sencond spicc added;
8. surpport both auto core clk and  fixed core clk rate setting:
   set dts "fixed_core_rate = <200000000(example)>" to use fixed
   core rate. otherwise, to use auto core clk.
9. support loop-back mode;
10. support DMA transfer;
11. must delete 1000M from parent clk.
12. It will be wrong when enhance divider=2. we have to add a flag
   CLK_DIVIDER_PROHIBIT_ZERO to shield against it.

Change-Id: I820a52e6d31d3fe2e3615a0f4c5a07c17d11914d
Signed-off-by: Sunny Luo <sunny.luo@amlogic.com>