ASoC: mediatek: mt2701: add AFE HDMI register definitions

ASoC: mediatek: mt2701: add AFE HDMI register definitions

Add register offsets and bit defines for the MT2701/MT7623N AFE
HDMI audio output path: the HDMI BCK divider in AUDIO_TOP_CON3,
the HDMI output memif control and descriptor registers, the 8-bit
AFE_HDMI_CONN0 interconnect, and the AFE_8CH_I2S_OUT_CON engine
that drives the HDMI TX serial link. These are a prerequisite for
adding an HDMI playback path to the mt2701 AFE driver and have no
behavioural effect on their own.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Link: https://patch.msgid.link/2c2a2e3e5d01da4a130160f5d5ffbd2a3808fe12.1776998727.git.daniel@makrotopia.org
Signed-off-by: Mark Brown <broonie@kernel.org>