clk: sunxi-ng: Move SoC driver conditions to dependencies

Do not duplicate the same expression on the `default` line, so the two
lines do not need to be kept in sync. Drivers stay disabled under
COMPILE_TEST because of the `default ARCH_SUNXI` applied to SUNXI_CCU.

Three drivers had no conditions.
 - SUN6I_RTC_CCU and SUN8I_DE2_CCU are used on current hardware
   regardless of CPU architecture.
 - SUN8I_R_CCU is only used on pre-H6 SoCs, which means no RISCV SoCs.

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20221231231429.18357-3-samuel@sholland.org


Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>