drm/bridge: dw-hdmi: Use automatic CTS generation mode when using non-AHB audio

When using an I2S source using a different clock source (usually the I2S
audio HW uses dedicated PLLs, different from the HDMI PHY PLL), fixed
CTS values will cause some frequent audio drop-out and glitches as
reported on Amlogic, Allwinner and Rockchip SoCs setups.

Setting the CTS in automatic mode will let the HDMI controller generate
automatically the CTS value to match the input audio clock.

The DesignWare DW-HDMI User Guide explains:
  For Automatic CTS generation
  Write "0" on the bit field "CTS_manual", Register 0x3205: AUD_CTS3

The DesignWare DW-HDMI Databook explains :
  If "CTS_manual" bit equals 0b this registers contains "audCTS[19:0]"
  generated by the Cycle time counter according to specified timing.

Cc: Jernej Skrabec <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Heiko Stuebner <[email protected]>
Cc: Jerome Brunet <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Tested-by: Jernej Skrabec <[email protected]>
Reviewed-by: Jernej Skrabec <[email protected]>
Tested-by: Douglas Anderson <[email protected]>
Signed-off-by: Andrzej Hajda <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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