clk: sunxi-ng: h616: Add sigma-delta modulation settings for audio PLL

Allwinner has previously released a H616 audio driver which also
provides sigma-delta modulation for the audio PLL clocks. This approach
is used in other Allwinner SoCs, including the H3 and A64.

The manual-provided clock values are:
PLL_AUDIO(hs) = 24 MHz*N/M1
PLL_AUDIO(4X) = 24 MHz*N/M0/M1/P
PLL_AUDIO(2X) = 24 MHz*N/M0/M1/P/2
PLL_AUDIO(1X) = 24 MHz*N/M0/M1/P/4

A fixed post-divider of 2 is used to account for a M0 divider of
2, which cannot be modelled by the existing macros and ccu_nm struct.

Add SDM to the H616 clock control unit driver.

Signed-off-by: Ryan Walklin <[email protected]>
Tested-by: Marcus Cooper <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>
Link: https://patch.msgid.link/[email protected]
[[email protected]: Fixed whitespace errors]
Signed-off-by: Chen-Yu Tsai <[email protected]>

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