ASoC: Intel, Keembay-i2s: Add hdmi-i2s compatible string

Add intel,keembay-hdmi-i2s compatible string to support the
HDMI interface.

Signed-off-by: Sia Jee Heng <jee.heng.sia@intel.com>
Link: https://lore.kernel.org/r/20210204014258.10197-4-jee.heng.sia@intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>