clk: sunxi: Implement SPI clocks, resets

- Implement SPI AHB, MOD clocks via ccu_clk_gate for all
  supported Allwinner SoCs
- Implement SPI resets via ccu_reset for all supported
  Allwinner SoCs.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>